DTC 56

CIRCUIT OPERATION
If a fail-safe is triggered or ATF temperature is high while driving forward, the PCM flashes the "N" range light once per second (triggered fail-safe), or twice per second (high A/T fluid temperature). The PCM does this by switching battery positive voltage to terminal 121.

DTC SET CONDITIONS
- If the PCM detects a fail-safe condition, it will attempt to illuminate the "N" range light. The PCM sends a 12-volt pulse for 60 - 180 ms. If it does not detect a voltage drop during the pulse, it waits about 60 seconds and pulses 12 volts again for 60 - 180 ms. If the PCM does no detect the voltage drop before the ignition switch is turned "LOCK" (OFF), the PCM will consider it as an open circuit of the "N" range light circuit and output code number "56,"

TROUBLESHOOTING HINTS
The most likely causes for this code to be set:
- Defective "N" range light bulb
- Damaged harness, connector
- Malfunction of the PCM

DIAGNOSIS
STEP 1. Check And Replace The Light Bulb.
Remove the combination meter to check the "N" range light bulb.
If defective, replace the bulb. Refer to Chassis Electrical - Combination Meter - Combination Meters.
If not defective, go to Step 2.

STEP 2. Check Harness Connector C-43 At The Combination Meter For Damage.





If harness connector C-43 is damaged, repair or replace it. Refer to Harness Connector Inspection. Recheck for DTCs.
If harness connector C-43 is in good condition, go to Step 3.

STEP 3. Check Harness Connector C-61 <2.4L Engine> Or C-63 <3.0L Engine> At The PCM For Damage.





If harness connector C-61 <2.4L Engine> or C-63 <3.0L Engine> is damaged, repair or replace it. Refer to Harness Connector Inspection.
If harness connector C-61 <2.4L Engine> or C-63 <3.0L Engine> is in good condition, repair the harness wires or the connectors between the PCM and the combination meter. Recheck for DTCs.
If malfunction is eliminated, diagnosis is complete.
If malfunction is not eliminated, go to Step 4.

STEP 4. Check The Ground For Damage.





If the ground is damaged, repair or replace it. Refer to Harness Connector Inspection.
If the ground is in good condition, repair the harness wires or the connectors between the PCM and the ground. Recheck for DTCs.
If malfunction is eliminated, diagnosis is complete.
If malfunction is not eliminated, replace the PCM. The immobilizer-ECU and the ignition key should be replaced together with it. Refer to Ignition Switch and Immobilizer System - Ignition Switch and Immobilizer System.