( TL19E20A20326926935FAAT00 )

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 (44P), then disconnect the HDS.

1. Measure the resistance between ECM/PCM connector terminals A36 and A37.

Is there about 88-111 Ω?

YES | - | Go to Step 33 .
NO | - | Go to Step 5 .

1. Disconnect these connectors:
   - Gauge control module 32P.
   - VSA modulator-control unit 47P.
   - Yaw rate-lateral acceleration sensor 4P.
   - EPS control unit D (28P).
   - SRS unit A (39P).
   - Navigation unit 32P (with navigation system)

1. Check for continuity between ECM/PCM connector terminals A36 and A37.

Is there continuity?

YES | - | Repair short in the wire between the ECM/PCM terminals A36 and A37 * .■
NO | - | Go to Step 7 .

1. Connect ECM/PCM connector terminal A36 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 (A36) 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 (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 11 .
NO | - | Repair open in the wire between the ECM/PCM (A36) and the EPS control unit.■

1. Remove the jumper wire from ECM/PCM connector A (44P).

1. Connect ECM/PCM connector terminal A37 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 14 .
NO | - | Repair open in the wire between the ECM/PCM (A37) 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 15 .
NO | - | Repair open in the wire between the ECM/PCM (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 16 .
NO | - | Repair open in the wire between the ECM/PCM (A37) and the EPS control unit.■

1. Reconnect the gauge control module 32P connector.

1. Measure the resistance between ECM/PCM connector terminals A36 and A37.

Is there about 108−132 Ω?

YES | - | Go to Step 18 .
NO | - | Substitute a known-good gauge control module. If the HDS identify the vehicle, replace the original gauge control module. ■

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 A36 and A37.

Is there about 2.34−2.86 kΩ?

YES | - | Go to Step 21 .
NO | - | Substitute a known-good VSA modulator-control unit. If the HDS identify the vehicle, replace the original VSA modulator-control unit. ■

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 A36 and A37.

Is there about 2.34−2.86 kΩ?

YES | - | Go to Step 24 .
NO | - | Substitute a known-good yaw rate-lateral acceleration sensor. If the HDS identify the vehicle, replace the original yaw rate-lateral acceleration sensor. ■

1. Disconnect the yaw rate-lateral acceleration sensor 4P connector.

1. Reconnect EPS control unit connector D (28P).

1. Measure the resistance between ECM/PCM connector terminals A36 and A37.

Is there about 2.34−2.86 kΩ?

YES | - | Go to Step 27 .
NO | - | Substitute a known-good EPS control unit. If the HDS identify the vehicle, replace the original EPS control unit. ■

1. Disconnect EPS control unit connector D (28P).

1. Reconnect SRS unit connector A (39P).

1. Measure the resistance between ECM/PCM connector terminals A36 and A37.

Is there about 2.34−2.86 kΩ?

YES

-

- With navigation system: Go to Step 30 .
- Without navigation system: 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 | - | Substitute a known-good SRS unit. If the HDS identify the vehicle, replace the original SRS unit. ■

1. Disconnect SRS unit connector A (39P).

1. Reconnect the navigation unit 32P connector.

1. Measure the resistance between ECM/PCM connector terminals A36 and A37.

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 | - | Substitute a known-good navigation unit. If the HDS identify the vehicle, replace the original navigation unit. ■

1. Disconnect these connectors:
   - Gauge control module 32P.
   - VSA modulator-control unit 47P.
   - Yaw rate-lateral acceleration sensor 4P.
   - EPS control unit D (28P).
   - SRS unit A (39P).
   - Navigation unit 32P (with navigation system)

1. Check for continuity between ECM/PCM connector terminal A36 and body ground.

Is there continuity?

YES | - | Repair short in the wire between the ECM/PCM terminals A36 and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, the EPS control unit, the SRS unit, the navigation unit (with navigation system), or the DLC.■
NO | - | Go to Step 35 .

1. Check for continuity between ECM/PCM connector terminal A37 and body ground.

Is there continuity?

YES | - | Repair short in the wire between the ECM/PCM terminals A37 and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, the EPS control unit, the SRS unit, the navigation unit (with navigation system), or the DLC.■
NO | - | Go to Step 36 .

1. Reconnect all connectors.

1. Connect the HDS to the DLC.

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 | - | Replace the gauge control module. ■
NO | - | Go to Step 40 .

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 | - | Replace the VSA modulator-control unit. ■
NO | - | Go to Step 44 .

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 | - | Replace the yaw rate-lateral acceleration sensor. ■
NO | - | Go to Step 48 .

1. Turn the ignition switch to LOCK (0).

1. Reconnect the yaw rate-lateral acceleration sensor 4P connector.

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 | - | Replace the EPS control unit. ■
NO | - | Go to Step 52 .

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 | - | Replace the SRS unit. ■

NO

-

- With navigation system: Go to Step 56 .
- Without navigation system: 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. ■

1. Turn the ignition switch to LOCK (0).

1. Reconnect SRS unit connector A (28P).

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 | - | Replace the navigation unit. ■
NO | - | 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. ■