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OBD2 Diagnostics reading project

Mlines — Sun, 01 Nov 2026 11:28:10 GMT

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ECU diagnostic CAN addresses

Mlines — Sun, 01 Nov 2026 10:30:11 GMT

0x751 Central gateway

ECU diagnostic CAN addresses

Mlines — Sun, 01 Nov 2026 10:14:31 GMT

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= Suzuki Jimny JB74 - CAN bus devices and the commands they answer =

'''Status:''' work in progress. This page lists every module that answered on the OBD socket (DLC) of one RHD UK-market 2021 Jimny, its request and reply CAN IDs, and the diagnostic commands seen so far. Many sections are short because only identification and fault-code requests have been captured. See [[OBD2 Diagnostics reading project]] for how the captures were made and for the TPMS data in detail.

== How to read this page ==
* All IDs are 11-bit CAN IDs on the OBD socket (pins 6 and 14, 500 kbit/s). The "request ID" is the header a tool sends to; the "reply ID" is where the module answers.
* Commands are shown as the payload bytes in hex, without the ISO-TP length byte. Replies longer than 7 bytes are sent as several frames; the tables show them reassembled.
* '''KWP-style''' modules use services such as <code>1A</code> (read ECU identification) and <code>18</code> (read DTCs by status). '''UDS-style''' modules use <code>22</code> (read data by identifier) and <code>19</code> (read DTCs).
* The reply ID is not always the request ID plus 8: the engine is +0x08, the 0x261 to 0x274 group is +0x400, and all others are +0x10.
* Identification strings are ASCII Suzuki part numbers. The first one in each module (<code>1A 8E</code> or <code>22 F1 01</code>) has no trailing character; the second (<code>1A 8A</code> or <code>22 F1 88</code>) ends in <code>*</code>. They do not always equal the number printed on the module's label.
* Commands marked ''captured'' were seen in a trace. Nothing here has been sent to a module by us except the TPMS requests.

== Device table ==
{| class="wikitable"
! Request ID !! Reply ID !! Style !! Module !! Identification reply (first / second) !! How the module was identified
|-
| [[#0x7E0 ECM|0x7E0]] || 0x7E8 || KWP || ECM || 33980-78R0 / 33980-78RC* || Standard engine address
|-
| [[#0x261 ABS (inferred)|0x261]] || 0x661 || KWP || ABS (inferred) || 56100-77RA / 56100-78RF* || Only brake module left by elimination
|-
| [[#0x263 EPS controller|0x263]] || 0x663 || KWP || EPS controller || 38720-77R0 / 38720-77R0* || Parts catalogue (38720-77R01)
|-
| [[#0x271 Body control module|0x271]] || 0x671 || KWP || Body control module || 36775-77R0 / 36775-77RC* || Parts catalogue (36775-77RC2 to RC4)
|-
| [[#0x274 Instrument cluster|0x274]] || 0x674 || KWP || Instrument cluster || 34100-78R0 / 34110-78RD* || Rev counter sweep test
|-
| [[#0x798 TPMS controller|0x798]] || 0x7A8 || KWP || TPMS controller || 37160-61M0 / 37120-78R0* || Label (Model No. P61M0) and parts catalogue
|-
| [[#0x79A Combination switch (lighting and turn)|0x79A]] || 0x7AA || KWP || Combination switch (lighting and turn) || 37210-74PA / 37210-74PE* || Parts catalogue (37210-74PE2)
|-
| [[#0x778 Dual sensor brake support (inferred)|0x778]] || 0x788 || KWP || Dual sensor brake support (inferred) || 33990-52R0 / 33990-78R8* || By elimination
|-
| [[#0x793 Airbag (SRS) controller|0x793]] || 0x7A3 || UDS || Airbag (SRS) controller || 38910-77R0 / 38910-78RC* || Parts catalogue (38910-78RC0)
|-
| [[#0x772 4WD shift controller|0x772]] || 0x782 || UDS || 4WD shift controller || 38885-77R0 / 38885-78R0* || Parts catalogue (38885-78R01)
|-
| [[#0x799 E-call controller|0x799]] || 0x7A9 || UDS || E-call controller || 38960-78RA / 38960-78RA* || Parts catalogue (38960-78RA0, RA1)
|-
| [[#0x751 Central gateway|0x751]] || 0x761 || UDS || Central gateway || 33580-79R0 / 33580-78R0* || Label (33580-79R01) and parts catalogue
|}

Two more addresses, [[#Addresses probed with no reply|0x273 and 0x262]], were probed by the scan tool and did not answer.

The names marked "inferred" are guesses from elimination and part-number series, not confirmed by a label or test.

== 0x7E0 ECM ==
Request <code>0x7E0</code>, reply <code>0x7E8</code>. This is the standard OBD engine address, so standard mode 01 PIDs should be available here, but none were captured.
{| class="wikitable"
! Request !! Reply !! Meaning
|-
| <code>3E</code> || <code>7E</code> || Tester present (captured)
|-
| <code>1A 8E</code> || <code>5A 8E</code> + ASCII <code>33980-78R0</code> || ECU identification (captured)
|-
| <code>1A 8A</code> || <code>5A 8A</code> + ASCII <code>33980-78RC*</code> || ECU identification (captured)
|-
| <code>18 00 FF 00</code> || <code>58 00</code> || Read DTCs by status: none stored (captured)
|}

== 0x261 ABS (inferred) ==
Request <code>0x261</code>, reply <code>0x661</code>. The name is inferred: this is the only brake module left in the scan report after the others were matched, and 56100 looks like a brake part-number series. Not confirmed.
{| class="wikitable"
! Request !! Reply !! Meaning
|-
| <code>3E</code> || <code>7E</code> || Tester present (captured)
|-
| <code>1A 8E</code> || <code>5A 8E</code> + ASCII <code>56100-77RA</code> || ECU identification (captured)
|-
| <code>1A 8A</code> || <code>5A 8A</code> + ASCII <code>56100-78RF*</code> || ECU identification (captured)
|-
| <code>18 00 FF 00</code> || <code>58 00</code> || DTCs: none stored (captured)
|}

== 0x263 EPS controller ==
Request <code>0x263</code>, reply <code>0x663</code>. Matches parts catalogue entry 38720-77R01 (EPS controller).
{| class="wikitable"
! Request !! Reply !! Meaning
|-
| <code>3E</code> || <code>7E</code> || Tester present (captured)
|-
| <code>1A 8E</code> || <code>5A 8E</code> + ASCII <code>38720-77R0</code> || ECU identification (captured)
|-
| <code>1A 8A</code> || <code>5A 8A</code> + ASCII <code>38720-77R0*</code> || ECU identification (captured)
|-
| <code>18 00 FF 00</code> || <code>58 00</code> || DTCs: none stored (captured)
|}

== 0x271 Body control module ==
Request <code>0x271</code>, reply <code>0x671</code>. Matches parts catalogue entries 36775-77RC2 to RC4 (body control module, RHD).
{| class="wikitable"
! Request !! Reply !! Meaning
|-
| <code>3E</code> || <code>7E</code> || Tester present (captured)
|-
| <code>1A 8E</code> || <code>5A 8E</code> + ASCII <code>36775-77R0</code> || ECU identification (captured)
|-
| <code>1A 8A</code> || <code>5A 8A</code> + ASCII <code>36775-77RC*</code> || ECU identification (captured)
|-
| <code>18 00 FF 00</code> || <code>58 00</code> || DTCs: none stored (captured)
|}

== 0x274 Instrument cluster ==
Request <code>0x274</code>, reply <code>0x674</code>. Confirmed by the rev counter sweep test.
{| class="wikitable"
! Request !! Reply !! Meaning
|-
| <code>3E</code> or <code>3E 00</code> || <code>7E</code> || Tester present, about every 2.15 s during the sweep test (captured)
|-
| <code>1A 8E</code> || <code>5A 8E</code> + ASCII <code>34100-78R0</code> || ECU identification (captured)
|-
| <code>1A 8A</code> || <code>5A 8A</code> + ASCII <code>34110-78RD*</code> (last byte of the reply is <code>06</code>) || ECU identification (captured)
|-
| <code>18 00 FF 00</code> || <code>58 00</code> || DTCs: none stored (captured)
|-
| <code>30 01 07 80 40 00 00</code> || <code>70 01 07</code> || Starts the rev counter sweep (service 0x30, local ID 01, "short-term adjustment"). The cluster then sweeps up and down by itself (captured)
|-
| <code>30 01 07 80 00 00 00</code> || <code>7F 30 22</code> || Refused ("conditions not correct"). Possibly a stop request sent after the sweep had finished (captured)
|}
The meaning of the four control bytes (<code>80 40 00 00</code>) is not known. Other output tests (gauges, warning lights) have not been captured.

== 0x798 TPMS controller ==
Request <code>0x798</code>, reply <code>0x7A8</code>. The label on the module reads 37160-78R00, "BASE ASSY-TPMS", Model No. P61M0 (Continental A2C13930301, 433.92 MHz). The full data layout, calibration and app setups are on [[OBD2 Diagnostics reading project]].
{| class="wikitable"
! Request !! Reply !! Meaning
|-
| <code>3E</code> || <code>7E</code> || Tester present (captured)
|-
| <code>1A 8E</code> || <code>5A 8E</code> + ASCII <code>37160-61M0</code> || ECU identification; matches Model No. P61M0 on the label (captured)
|-
| <code>1A 8A</code> || <code>5A 8A</code> + ASCII <code>37120-78R0*</code> || ECU identification (captured)
|-
| <code>18 00 FF 00</code> || <code>58 00</code> (no codes) or <code>58 01 9A 31 20</code> (one code) || DTCs by status. The code <code>9A 31</code> is probably the left front low pressure warning (inferred). The status byte was <code>20</code> in the full scan and <code>E0</code> in earlier captures (captured)
|-
| <code>21 00</code> || <code>61 00</code> + 100 bytes || Sensor data block: four sensor records with ID, temperature-like value and pressure. The scan tool repeats it about twice a second (captured, decoded)
|}
ELM327 setup that works for <code>21 00</code>: <code>ATSH798</code>, <code>ATS0</code>, <code>ATL0</code>, <code>ATFCSH798</code>, <code>ATFCSD300000</code>, <code>ATFCSM1</code>, then <code>2100</code>.

== 0x79A Combination switch (lighting and turn) ==
Request <code>0x79A</code>, reply <code>0x7AA</code>. Matches parts catalogue entry 37210-74PE2 (switch assembly, lighting and turn, RHD).
{| class="wikitable"
! Request !! Reply !! Meaning
|-
| <code>3E</code> || <code>7E</code> || Tester present (captured)
|-
| <code>1A 8E</code> || <code>5A 8E</code> + ASCII <code>37210-74PA</code> || ECU identification (captured)
|-
| <code>1A 8A</code> || <code>5A 8A</code> + ASCII <code>37210-74PE*</code> || ECU identification (captured)
|-
| <code>18 00 FF 00</code> || <code>58 00</code> || DTCs: none stored (captured)
|}

== 0x778 Dual sensor brake support (inferred) ==
Request <code>0x778</code>, reply <code>0x788</code>. The name is inferred by elimination (the scan report's last unassigned module). Not confirmed.
{| class="wikitable"
! Request !! Reply !! Meaning
|-
| <code>3E</code> || <code>7E</code> || Tester present (captured)
|-
| <code>1A 8E</code> || <code>5A 8E</code> + ASCII <code>33990-52R0</code> || ECU identification (captured)
|-
| <code>1A 8A</code> || <code>5A 8A</code> + ASCII <code>33990-78R8*</code> || ECU identification (captured)
|-
| <code>18 00 FF 00</code> || <code>58 00</code> || DTCs: none stored (captured)
|}

== 0x793 Airbag (SRS) controller ==
Request <code>0x793</code>, reply <code>0x7A3</code>. Matches parts catalogue entry 38910-78RC0 (airbag controller, VAN).
{| class="wikitable"
! Request !! Reply !! Meaning
|-
| <code>3E 00</code> || <code>7E 00</code> || Tester present (captured)
|-
| <code>22 F1 01</code> || <code>62 F1 01</code> + ASCII <code>38910-77R0</code> || Identification (captured)
|-
| <code>22 F1 88</code> || <code>62 F1 88</code> + ASCII <code>38910-78RC*</code> || Identification (captured)
|-
| <code>19 02 FF</code> || <code>59 02 4B</code> || DTCs by status mask: none stored (captured)
|}

== 0x772 4WD shift controller ==
Request <code>0x772</code>, reply <code>0x782</code>. Matches parts catalogue entry 38885-78R01 (4WD shift controller).
{| class="wikitable"
! Request !! Reply !! Meaning
|-
| <code>3E</code> || <code>7F 3E 13</code> || Refused: incorrect message length. Sent four times by the scan tool (captured)
|-
| <code>3E 01</code> || <code>7F 3E 12</code> || Refused: sub-function not supported. Sent four times (captured)
|-
| <code>3E 00</code> || <code>7E 00</code> || Tester present (captured)
|-
| <code>22 F1 01</code> || <code>62 F1 01</code> + ASCII <code>38885-77R0</code> || Identification (captured)
|-
| <code>22 F1 88</code> || <code>62 F1 88</code> + ASCII <code>38885-78R0*</code> || Identification (captured)
|-
| <code>19 02 FF</code> || <code>59 02 4B</code> || DTCs by status mask: none stored (captured)
|}
The scan tool tried the KWP-style <code>3E</code> first and fell back to the UDS form <code>3E 00</code>.

== 0x799 E-call controller ==
Request <code>0x799</code>, reply <code>0x7A9</code>. Matches parts catalogue entries 38960-78RA0 and RA1 (E-call controller).
{| class="wikitable"
! Request !! Reply !! Meaning
|-
| <code>3E</code> || <code>7F 3E 13</code> || Refused: incorrect message length. Sent four times (captured)
|-
| <code>3E 01</code> || <code>7F 3E 12</code> || Refused: sub-function not supported. Sent four times (captured)
|-
| <code>3E 00</code> || <code>7E 00</code> || Tester present (captured)
|-
| <code>22 F1 01</code> || <code>62 F1 01</code> + ASCII <code>38960-78RA</code> || Identification (captured)
|-
| <code>22 F1 88</code> || <code>62 F1 88</code> + ASCII <code>38960-78RA*</code> || Identification (captured)
|-
| <code>19 02 FF</code> || <code>59 02 4B 92 4E 00 02</code> || One stored code record: <code>92 4E 00</code>, status <code>02</code>. The Launch report does not list it and its meaning is not known (captured)
|}

== 0x751 Central gateway ==
Request <code>0x751</code>, reply <code>0x761</code>. The label on the module reads 33580-79R01.
{| class="wikitable"
! Request !! Reply !! Meaning
|-
| <code>3E 00</code> || <code>7E 00</code> || Tester present (captured)
|-
| <code>22 F1 01</code> || <code>62 F1 01</code> + ASCII <code>33580-79R0</code> || Identification (captured)
|-
| <code>22 F1 88</code> || <code>62 F1 88</code> + ASCII <code>33580-78R0*</code> || Identification (captured)
|-
| <code>19 02 FF</code> || <code>59 02 4B</code> || DTCs by status mask: none stored (captured)
|}
The gateway sits between the OBD socket and the vehicle CAN bus. Whether it forwards requests to the other modules unchanged is not confirmed.

== Addresses probed with no reply ==
The scan tool sent tester-present (<code>3E</code>) about eight times each to <code>0x273</code> and <code>0x262</code> and received nothing from the expected reply IDs (<code>0x673</code> and <code>0x662</code>). They are probably modules this car does not have, such as an automatic transmission or auto-levelling controller. This is a guess.

== ELM327 notes ==
* Only <code>0x798</code> has been tested with an ELM327. For other modules, set <code>ATSH</code> to the request ID and <code>ATFCSH</code> to the same ID, and you may need <code>ATCRA</code> with the reply ID, because the reply is not always the request ID plus 8. This is untested.
* Replies from the 0x7xx modules are multi-frame for the identification strings, so the flow-control settings from the TPMS section probably apply there too. Untested.
* Do not send output-control commands (service <code>30</code> and similar) from a head-unit app while driving.

== Sources ==
* Owner PCAN-View captures of a Launch X431 CRP919 full health-check scan and rev counter sweep test, October 2026.
* Suzuki Jimny parts catalogue 9900B-40312-004 (type 1, October 2021), figures 350A, 351A and 351B.
* Labels on the TPMS controller and central gateway of the test car.

[[Category:Electrical - gen4]]

Template:Models

Mlines — Sun, 01 Nov 2026 10:12:31 GMT

Created page with "<span style="font-size:90%; color:#555;">'''Models:''' {{{1}}}{{#if:{{{untested|}}}| — ''untested on: {{{untested}}}''}}</span>"

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<span style="font-size:90%; color:#555;">'''Models:''' {{{1}}}{{#if:{{{untested|}}}| — ''untested on: {{{untested}}}''}}</span>

OBD2 Diagnostics reading project

Mlines — Thu, 29 Oct 2026 21:04:19 GMT

Other modules found by a full scan

Computerized vehicle failure diagnostics

Mlines — Thu, 29 Oct 2026 12:48:58 GMT

Introduction

@@ Line 1: / Line 1: @@
-= Suzuki Jimny JB74 (2021) - Reading TPMS data over the diagnostic CAN link =
+= Suzuki Jimny JB74 (2018+) - Reading TPMS data over the diagnostic CAN link =
 {{Donate}}
@@ Line 79: / Line 79: @@
 | <code>1A 8A</code> || <code>5A 8A</code> + ASCII <code>37120-78R0*</code> || ECU identification
 |-
-| <code>1A 8E</code> || <code>5A 8E</code> + ASCII <code>37160-61M0</code> || ECU identification
+| <code>1A 8E</code> || <code>5A 8E</code> + ASCII <code>37160-61M0</code> || ECU identification: matches the "Model No. P61M0" printed on the TPMS controller label
 |-
 | <code>18 00 FF 00</code> || <code>58 00</code> or <code>58 01 9A 31 E0</code> || Read DTCs by status (second form = one code reported; not decoded)
@@ Line 85: / Line 85: @@
 | <code>21 00</code> || <code>61 00</code> + 100 bytes || Sensor data block (repeated about twice a second by the scan tool)
 |}
 == Reading it with an ELM327 ==
@@ Line 157: / Line 159: @@
 Sensor IDs are specific to one car. Yours will differ.
-== Calibration (provisional) ==
+== Calibration ==
-Byte +6 against gauge readings:
+Byte +6 against gauge readings (bar). The five deflation-test counts were reconstructed from the app's displayed values.
 {| class="wikitable"
-! Raw !! Gauge
+! Raw !! Gauge (bar) !! Raw x 0.01372
 |-
-| 136 (rear left) || 1.868 bar
+| 131 (front right) || 1.795 || 1.797
 |-
-| 131 (rear right) || 1.795 bar
+| 126 || 1.73 || 1.729
 |-
-| 131 (front right) || 1.795 bar
+| 119 || 1.63 || 1.633
 |-
-| 128 (front left, start) || about 25 psi (from memory)
+| 112 || 1.54 || 1.537
 |-
-| 110 (front left, lowest) || about 21 psi (from memory)
+| 101 || 1.39 || 1.386
 |}
-Straight-line fit through these points:
+The last five rows are from one tyre during a slow deflation (assumed front left).
-* bar = raw x 0.01627 - 0.344
+* bar = raw x 0.01372
-* psi = raw x 0.236 - 5
+* psi = raw x 0.199
-The two front-left gauge values were remembered, not recorded, and most of the fit comes from them. Treat the equations as an estimate to be replaced by better data.
+No offset is needed, which suggests the byte holds gauge pressure. All points are within 0.004 bar except the lowest (0.027 bar off), which may be sensor update lag or slight non-linearity. More readings at low and high pressure are needed.
 == Torque Pro custom PIDs ==
@@ Line 204: / Line 212: @@
 | Rear right || AJ || AK
 |}
-Example: <code>Q*0.01627-0.344</code>. Letters must be upper case. Whether Torque accepts two-letter variables is ''unconfirmed''.
+Example: <code>Q*0.01372</code>. Letters must be upper case. Whether Torque accepts two-letter variables is ''unconfirmed''.
 === Known problem ===
 Using dongle 1 (generic Chinese ELM327-based) with Torque Pro on the XTRONS PX90, Torque read bytes <code>A</code> to <code>D</code> (first line of the reply) correctly, but every byte from <code>E</code> onward returned -1, even though a terminal received the full 102 bytes with the same commands. The start-command field is applied (adding <code>ATH1</code> changed the output). Tried without success: turning off "Faster communication", removing <code>ATS0</code>. Not yet tried: <code>ATAT0, ATSTFF</code> timeout settings, other apps, and the Veepeak OBDCheck BLE+ (dongle 2).. Unresolved.
 == Open questions ==

← Older revision		Revision as of 12:48, 29 October 2026
Line 13:		Line 13:

	Whenever a "sophisticated" issue with the vehicle occurs, using computerized diagnostics to determine the failure code is usually essential to determine the what is actually the problem.		Whenever a "sophisticated" issue with the vehicle occurs, using computerized diagnostics to determine the failure code is usually essential to determine the what is actually the problem.
		+
		+

	Please also see [[OBD2_Diagnostics_reading_project\|Diagnostics]] for more detailed work on OBD2		Please also see [[OBD2_Diagnostics_reading_project\|Diagnostics]] for more detailed work on OBD2

@@ Line 49: / Line 49: @@
 == 0x7E0 ECM ==
 Request <code>0x7E0</code>, reply <code>0x7E8</code>. This is the standard OBD engine address, so standard mode 01 PIDs should be available here, but none were captured.
 {| class="wikitable"
@@ Line 63: / Line 65: @@
 == 0x261 ABS (inferred) ==
 Request <code>0x261</code>, reply <code>0x661</code>. The name is inferred: this is the only brake module left in the scan report after the others were matched, and 56100 looks like a brake part-number series. Not confirmed.
 {| class="wikitable"
@@ Line 77: / Line 81: @@
 == 0x263 EPS controller ==
 Request <code>0x263</code>, reply <code>0x663</code>. Matches parts catalogue entry 38720-77R01 (EPS controller).
 {| class="wikitable"
@@ Line 91: / Line 97: @@
 == 0x271 Body control module ==
 Request <code>0x271</code>, reply <code>0x671</code>. Matches parts catalogue entries 36775-77RC2 to RC4 (body control module, RHD).
 {| class="wikitable"
@@ Line 105: / Line 113: @@
 == 0x274 Instrument cluster ==
 Request <code>0x274</code>, reply <code>0x674</code>. Confirmed by the rev counter sweep test.
 {| class="wikitable"
@@ Line 124: / Line 134: @@
 == 0x798 TPMS controller ==
 Request <code>0x798</code>, reply <code>0x7A8</code>. The label on the module reads 37160-78R00, "BASE ASSY-TPMS", Model No. P61M0 (Continental A2C13930301, 433.92 MHz). The full data layout, calibration and app setups are on [[OBD2 Diagnostics reading project]].
 {| class="wikitable"
@@ Line 141: / Line 153: @@
 == 0x79A Combination switch (lighting and turn) ==
 Request <code>0x79A</code>, reply <code>0x7AA</code>. Matches parts catalogue entry 37210-74PE2 (switch assembly, lighting and turn, RHD).
 {| class="wikitable"
@@ Line 155: / Line 169: @@
 == 0x778 Dual sensor brake support (inferred) ==
 Request <code>0x778</code>, reply <code>0x788</code>. The name is inferred by elimination (the scan report's last unassigned module). Not confirmed.
 {| class="wikitable"
@@ Line 169: / Line 185: @@
 == 0x793 Airbag (SRS) controller ==
 Request <code>0x793</code>, reply <code>0x7A3</code>. Matches parts catalogue entry 38910-78RC0 (airbag controller, VAN).
 {| class="wikitable"
@@ Line 183: / Line 201: @@
 == 0x772 4WD shift controller ==
 Request <code>0x772</code>, reply <code>0x782</code>. Matches parts catalogue entry 38885-78R01 (4WD shift controller).
 {| class="wikitable"
@@ Line 202: / Line 222: @@
 == 0x799 E-call controller ==
 Request <code>0x799</code>, reply <code>0x7A9</code>. Matches parts catalogue entries 38960-78RA0 and RA1 (E-call controller).
 {| class="wikitable"
@@ Line 220: / Line 242: @@
 == 0x751 Central gateway ==
 Request <code>0x751</code>, reply <code>0x761</code>. The label on the module reads 33580-79R01.
 {| class="wikitable"