F-CAN Circuit Troubleshooting - PGM-FI System
NOTE: Information marked with an asterisk ( * ) applies to the CANL line.
  1. Turn the ignition switch OFF.
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM connector A (44P), then disconnect the HDS.
  1. Measure resistance between ECM connector terminals A36 and A37.
Is there about 88−111 Ω?
YES -
Go to Step 45 .
NO -
Go to Step 5 .
  1. Disconnect the engine compartment wire harness 10P connector; LHD model, RHD model.
  1. Check for continuity between ECM connector terminals A36 and A37.
Is there continuity?
YES -
Repair short in the wire between the ECM terminals A36 and A37 * .■
NO -
Go to Step 12 .
  1. Connect ECM connector terminal A36 to body ground with a jumper wire.
  1. Check for continuity between gauge control module (tach) 36P connector terminal No. 1 and body ground.
Is there continuity?
YES -
Go to Step 14 .
NO -
Repair open in the wire between the ECM (A36) and the gauge control module (tach).■
  1. Check for continuity between VSA modulator-control unit 46P connector terminal No. 39 and body ground.
Is there continuity?
YES -
Go to Step 15 .
NO -
Repair open in the wire between the ECM (A36) and the VSA modulator-control unit.■
  1. Check for continuity between EPS control unit connector D (28P) terminal No. 1 and body ground.
Is there continuity?
YES -
Go to Step 16 .
NO -
Repair open in the wire between the ECM (A36) and the EPS control unit.■
  1. Check for continuity between SRS unit connector A (28P) terminal No. 11 and body ground.
Is there continuity?
YES -
NO -
Repair open in the wire between the ECM (A36) and the SRS unit.■
  1. Check for continuity between engine compartment wire harness 10P connector terminal No. 7 and body ground.
Is there continuity?
YES -
Go to Step 18 .
NO -
  • Repair open in the wire between the ECM (A36) and the clutch actuator wire harness.
  • Check the clutch actuator wire harness for an open.■
  1. Remove the jumper wire from ECM connector A (44P).
  1. Connect ECM connector terminal A37 to body ground with a jumper wire.
  1. Check for continuity between gauge control module (tach) 36P connector terminal No. 19 and body ground.
Is there continuity?
YES -
Go to Step 21 .
NO -
Repair open in the wire between the ECM (A37) and the gauge control module (tach).■
  1. Check for continuity between VSA modulator-control unit 46P connector terminal No. 38 and body ground.
Is there continuity?
YES -
Go to Step 22 .
NO -
Repair open in the wire between the ECM (A37) and the VSA modulator-control unit.■
  1. Check for continuity between EPS control unit connector D (28P) terminal No. 15 and body ground.
Is there continuity?
YES -
Go to Step 23 .
NO -
Repair open in the wire between the ECM (A37) and the EPS control unit.■
  1. Check for continuity between SRS unit connector A (28P) terminal No. 12 and body ground.
Is there continuity?
YES -
NO -
Repair open in the wire between the ECM (A37) and the SRS unit.■
  1. Check for continuity between engine compartment wire harness 10P connector terminal No. 6 and body ground.
Is there continuity?
YES -
Go to Step 25 .
NO -
  • Repair open in the wire between the ECM (A37) and the clutch actuator wire harness.
  • Check the clutch actuator wire harness for an open.■
  1. Reconnect the gauge control module (tach) 36P connector.
  1. Measure resistance between ECM connector terminals A36 and A37.
Is there about 2.34−2.86 kΩ?
YES -
Go to Step 27 .
NO -
  1. Disconnect the gauge control module (tach) 36P connector.
  1. Reconnect the VSA modulator-control unit 46P connector.
  1. Measure resistance between ECM connector terminals A36 and A37.
Is there about 108−132 Ω?
YES -
Go to Step 30 .
NO -
  1. Disconnect the VSA modulator-control unit 46P connector.
  1. Reconnect the yaw rate/lateral acceleration sensor 4P connector.
  1. Measure resistance between ECM connector terminals A36 and A37.
Is there continuity?
YES -
NO -
Go to Step 33 .
  1. Reconnect EPS control unit connector D (28P).
  1. Measure resistance between ECM connector terminals A36 and A37.
Is there about 2.34−2.86 kΩ?
YES -
Go to Step 36 .
NO -
  1. Disconnect EPS control unit connector D (28P).
  1. Reconnect SRS unit connector A (28P).
  1. Measure resistance between ECM connector terminals A36 and A37.
Is there about 2.34−2.86 kΩ?
YES -
NO -
  1. Disconnect SRS unit connector A (28P).
  1. Reconnect the engine room wire harness 10P connector.
  1. Measure resistance between ECM connector terminals A36 and A37.
Is there about 2.34−2.86 kΩ?
YES -
Go to Step 42 .
NO -
  1. Disconnect the engine room wire harness 10P connector.
  1. Measure resistance between ECM connector terminals A36 and A37.
Is there about 2.34−2.86 kΩ?
YES -
Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM. ■
NO -
  1. Disconnect the engine compartment wire harness 10P connector (with i-SHIFT system); LHD model, RHD model.
  1. Check for continuity between ECM connector terminal A36 and body ground.
Is there continuity?
YES -
Repair short in the wire between the ECM terminals A36 and the gauge control module (tach), the VSA modulator-control unit, the yaw rate/lateral acceleration sensor, the EPS control unit, the SRS unit, the TCM (with i-SHIFT system); or the DLC.■
NO -
Go to Step 52 .
  1. Check for continuity between ECM connector terminal A37 and body ground.
Is there continuity?
YES -
Repair short in the wire between the ECM terminals A37 and the gauge control module (tach), the VSA modulator-control unit, the yaw rate/lateral acceleration sensor, the EPS control unit, the SRS unit, the TCM (with i-SHIFT system); or the DLC.■
NO -
Go to Step 53 .
  1. Reconnect all connectors.
  1. Disconnect the gauge control module (tach) 36P connector.
  1. Turn the ignition switch ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
Go to Step 57 .
  1. Turn the ignition switch OFF.
  1. Reconnect the gauge control module (tach) 36P connector.
  1. Disconnect the VSA modulator-control unit 37P connector.
  1. Turn the ignition switch ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
Go to Step 61 .
  1. Turn the ignition switch OFF.
  1. Reconnect the VSA modulator-control unit 37P connector.
  1. Disconnect the yaw rate/lateral acceleration sensor 4P connector.
  1. Turn the ignition switch ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
Go to Step 65 .
  1. Turn the ignition switch OFF.
  1. Disconnect EPS control unit connector D (28P).
  1. Turn the ignition switch ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
Go to Step 69 .
  1. Turn the ignition switch OFF.
  1. Reconnect EPS control unit connector D (28P).
  1. Disconnect SRS unit connector A (28P).
  1. Turn the ignition switch ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
  1. Turn the ignition switch OFF.
  1. Reconnect SRS unit connector A (28P).
  1. Disconnect the engine compartment wire harness 10P connector.
  1. Turn the ignition switch ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
Go to Step 77 .
  1. Turn the ignition switch OFF.
  1. Reconnect the engine compartment wire harness 10P connector.
  1. Disconnect the gear shift control module 12P connector.
  1. Turn the ignition switch ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM. ■