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F-CAN Circuit Troubleshooting

NOTE: Information marked with an asterisk ( * ) applies to the CANL line.
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector A (49P), then disconnect the HDS.
  1. Measure the resistance between ECM/PCM connector terminals A3 and A4.
Is there about 108−132 Ω?
YES -
Go to Step 44 .
NO -
Go to Step 5 .
  1. Disconnect these connectors:

  1. Check for continuity between ECM/PCM connector terminals A3 and A4.
Is there continuity?
YES -
Repair short in the wire between ECM/PCM terminals A3 and A4 * .■
NO -
Go to Step 7 .

  1. Connect ECM/PCM connector terminal A3 to body ground with a jumper wire.

  1. Check for continuity between gauge control module 32P connector terminal No. 30 and body ground.
Is there continuity?
YES -
NO -
Repair open in the wire between the ECM/PCM (A3) and the gauge control module.■

  1. Check for continuity between VSA modulator-control unit 36P connector terminal No. 14 and body ground.
Is there continuity?
YES -
Go to Step 11 .
NO -
Repair open in the wire between the ECM (A3) and the VSA modulator-control unit.■

  1. Check for continuity between ABS modulator-control unit 25P connector terminal No. 1 and body ground.
Is there continuity?
YES -
Go to Step 11 .
NO -
Repair open in the wire between the ECM/PCM (A3) and the ABS modulator-control unit.■

  1. Check for continuity between EPS control unit connector C (16P) terminal No. 10 and body ground.
Is there continuity?
YES -
NO -
Repair open in the wire between the ECM/PCM (A3) and the EPS control 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 13 .
NO -
  • Repair open in the wire between the ECM (A3) and the engine compartment wire harness.■
  • Check the clutch actuator wire harness for an open.■
  1. Remove the jumper wire from ECM/PCM connector A (49P).

  1. Connect ECM/PCM connector terminal A4 to body ground with a jumper wire.

  1. Check for continuity between gauge control module 32P connector terminal No. 29 and body ground.
Is there continuity?
YES -
NO -
Repair open in the wire between the ECM/PCM (A4) and the gauge control module.■

  1. Check for continuity between VSA modulator-control unit 36P connector terminal No. 1 and body ground.
Is there continuity?
YES -
Go to Step 18 .
NO -
Repair open in the wire between the ECM (A4) and the VSA modulator-control unit.■

  1. Check for continuity between ABS modulator-control unit 25P connector terminal No. 17 and body ground.
Is there continuity?
YES -
Go to Step 18 .
NO -
Repair open in the wire between the ECM/PCM (A4) and the ABS modulator-control unit.■

  1. Check for continuity between EPS control unit connector C (16P) terminal No. 9 and body ground.
Is there continuity?
YES -
NO -
Repair open in the wire between the ECM/PCM (A4) and the EPS control 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 20 .
NO -
  • Repair open in the wire between the ECM (A4) and the engine compartment wire harness.■
  • Check the clutch actuator wire harness for an open.■
  1. Remove the jumper wire from ECM/PCM connector A (49P).
  1. Reconnect the gauge control module 32P connector.

  1. Measure the resistance between ECM/PCM connector terminals A3 and A4.
Is there about 108−132 Ω?
YES -
NO -
  1. Disconnect the gauge control module 32P connector.
  1. Reconnect the VSA modulator-control unit 36P connector.

  1. Measure the resistance between ECM connector terminals A3 and A4.
Is there about 2.34−2.86 kΩ?
YES -
Go to Step 26 .
NO -
  1. Disconnect the VSA modulator-control unit 36P connector.
  1. Reconnect the yaw rate-lateral/longitudinal acceleration sensor 5P connector.

  1. Measure the resistance between ECM connector terminals A3 and A4.
Is there about 2.34−2.86 Ω?
YES -
Go to Step 32 .
NO -
  1. Disconnect the gauge control module 32P connector.
  1. Reconnect the ABS modulator-control unit 25P connector.

  1. Measure the resistance between ECM/PCM connector terminals A3 and A4.
Is there about 2.34−2.86 kΩ?
YES -
Go to Step 32 .
NO -
  1. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 5P connector (With VSA) or ABS modulator-control unit 25P connector (With ABS).
  1. Reconnect EPS control unit connector C (16P).

  1. Measure the resistance between ECM/PCM connector terminals A3 and A4.
Is there about 2.34−2.86 kΩ?
YES -
Go to Step 35 .
NO -
  1. Disconnect EPS control unit connector C (16P).
  1. Reconnect SRS unit connector A (39P).

  1. Measure the resistance between ECM/PCM connector terminals A3 and A4.
Is there about 2.34−2.86 kΩ?
YES -
NO -
  1. Disconnect SRS unit connector A (39P).
  1. Reconnect the engine compartment wire harness 10P connector.

  1. Measure the resistance between ECM connector terminals A3 and A4.
Is there about 2.34−2.86 kΩ?
YES -
Go to Step 41 .
NO -
  1. Disconnect engine compartment wire harness 10P connector.
  1. Reconnect gear shift control module 12P connector.

  1. Measure the resistance between ECM connector terminals A3 and A4.
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 these connectors:

  1. Check for continuity between ECM/PCM connector terminal A3 and body ground.
Is there continuity?
YES -
Repair short in the wire between ECM/PCM terminals A3 and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral/longitudinal acceleration sensor, the ABS modulator-control unit, the EPS control unit, the SRS unit, the TCM, the gear shift control module, or the DLC.■
NO -
Go to Step 46 .

  1. Check for continuity between ECM/PCM connector terminal A4 and body ground.
Is there continuity?
YES -
Repair short in the wire between ECM/PCM terminals A4 and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral/longitudinal acceleration sensor, the ABS modulator-control unit, the EPS control unit, the SRS unit, the TCM, the gear shift control module, or the DLC.■
NO -
Go to Step 47 .
  1. Reconnect all connectors.
  1. Disconnect the gauge control module 32P connector.
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect the gauge control module 32P connector.
  1. Disconnect the VSA modulator-control unit 36P connector.
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
Go to Step 55 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect the VSA modulator-control unit 36P connector.
  1. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 5P connector.
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
Go to Step 63 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect gauge control module 32P connector.
  1. Disconnect ABS modulator-control unit 25P.
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
Go to Step 63 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect the yaw rate-lateral/longitudinal acceleration sensor 5P connector (With VSA) or ABS modulator-control unit 25P connector (With ABS).
  1. Disconnect EPS control unit connector C (16P).
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
Go to Step 67 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect EPS control unit connector D (28P).
  1. Disconnect SRS unit connector A (39P).
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect SRS unit connector A (39P).
  1. Disconnect the engine compartment wire harness 10P connector.
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
Go to Step 75 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect the engine compartment wire harness 10P connector.
  1. Disconnect the gear shift control module 12P connector
  1. Turn the ignition switch to 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.