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 79−111 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 the 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. 22 and body ground.
Is there continuity?
YES -
Go to Step 9 .
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 47P connector terminal No. 12 and body ground.
Is there continuity?
YES -
Go to Step 10 .
NO -
Repair open in the wire between the ECM/PCM (A3) 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 -
  • With driving support system: Go to Step 11 .
  • Without driving support system: Go to Step 12 .
NO -
Repair open in the wire between the ECM/PCM (A3) and the EPS control unit.■
  1. Check for continuity between ACC unit 20P connector terminal No. 10 and body ground.
Is there continuity?
YES -
Go to Step 12 .
NO -
Repair open in the wire between the ECM/PCM (A3) and the ACC unit.■
  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. 21 and body ground.
Is there continuity?
YES -
Go to Step 15 .
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 47P connector terminal No. 13 and body ground.
Is there continuity?
YES -
Go to Step 16 .
NO -
Repair open in the wire between the ECM/PCM (A4) 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 -
  • With driving support system: Go to Step 17 .
  • Without driving support system: Go to Step 18 .
NO -
Repair open in the wire between the ECM/PCM (A4) and the EPS control unit.■
  1. Check for continuity between ACC unit 20P connector terminal No. 20 and body ground.
Is there continuity?
YES -
Go to Step 18 .
NO -
Repair open in the wire between the ECM/PCM (A4) and the ACC unit.■
  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 -
Go to Step 20 .
NO -
  1. Disconnect the gauge control module 32P connector.
  1. Reconnect the VSA modulator-control unit 47P 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 23 .
NO -
  1. Disconnect the VSA modulator-control unit 46P connector.
  1. Reconnect the yaw rate-lateral acceleration sensor 4P connector.
  1. Measure the resistance between ECM/PCM connector terminals A3 and A4.
Is there about 2.34−2.86 kΩ?
YES -
  • With navigation system: Go to Step 26 .
  • Without navigation system: Go to Step 29 .
NO -
  1. Disconnect the yaw rate-lateral acceleration sensor 4P connector.
  1. Reconnect the navigation unit 32P 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 29 .
NO -
  1. Disconnect the navigation unit 32P connector (with navigation system) or the yaw rate-lateral acceleration sensor 4P connector (without navigation system).
  1. Reconnect EPS control unit connector D (28P).
  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 EPS control unit connector D (28P).
  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 LKAS control unit 26P 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 38 .
NO -
  1. Disconnect the LKAS control unit 26P connector.
  1. Reconnect the ACC unit 20P 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 41 .
NO -
  1. Disconnect the ACC unit 20P connector.
  1. Reconnect the E-pritensioner unit 14P connector.
  1. Measure the resistance between ECM/PCM connector terminals A3 and A4.
Is there about 2.34−2.86 kΩ?
YES -
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM , then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. ■
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 the ECM/PCM terminals A3 and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, the EPS control unit, the SRS unit, the LKAS control unit (with driving support system), the ACC unit (with driving support system), the E-pritensioner unit (with driving support system), the navigation unit (with navigation system), 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 the ECM/PCM terminals A4 and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, the EPS control unit, the SRS unit, the LKAS control unit (with driving support system), the ACC unit (with driving support system), the E-pritensioner unit (with driving support system), the navigation unit (with navigation system), 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 -
Go to Step 51 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect the gauge control module 32P connector.
  1. Disconnect the VSA modulator-control unit 47P 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 47P connector.
  1. Disconnect the yaw rate-lateral acceleration sensor 4P connector.
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
  • With navigation system: Go to Step 59 .
  • Without navigation system: Go to Step 63 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect the yaw rate-lateral acceleration sensor 4P connector.
  1. Disconnect the navigation unit 32P 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 the navigation unit 32P connector (with navigation system) or the yaw rate-lateral acceleration sensor 4P connector (without navigation system).
  1. Disconnect EPS control unit connector D (28P).
  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 LKAS control unit 26P 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 LKAS control unit 26P connector.
  1. Disconnect the ACC unit 20P connector.
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -
Go to Step 79 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect the ACC unit 20P connector.
  1. Disconnect the E-pritensioner unit 14P connector.
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
NO -