DTC 56

DTC 56: "N" Range Light System

CIRCUIT OPERATION
If a fail-safe is triggered while driving forward, the PCM flashes the "N" range light once per second (triggered fail-safe). 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 volts 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 short 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

Required Special Tool: MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check the light bulb.

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to the "ON" position.
^ The "N" range light in the combination meter flushes.
3. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the "N" range light flush?
YES: This malfunction is intermittent.
NO: Go to Step 2.

STEP 2. Check the "N" range light bulb.
1. Remove the combination meter.
2. Check the "N" range light bulb.
Q: Is the bulb in good conditions
YES: Go to Step 3.
NO: Replace the "N" range light bulb.

STEP 3. Check connector C-43 at combination meter for damage.

Q: Is the connector in good condition?
YES: Go to Step 4.
NO: Repair or replace it.

STEP 4. Check the continuity at combination meter connector C-43.

1. Disconnect connector C-43 and measure at the harness side.

2. Check for the continuity between terminal 12 and ground.
^ Should be less than 2 ohm.
Q: Is the continuity normal?
YES: Go to Step 6.
NO: Go to Step 5.

STEP 5. Check connectors C-43 at combination meter and C-78 at joint connector 2 for damage.

Q: Are the connectors in good condition?
YES: Repair harness open circuit or harness damage between combination meter connector C-43 terminal 12 and the ground.
NO: Repair or replace the defective connector(s).

STEP 6. Check connectors C-61 <2.4L Engine> or C-63 <3.0L Engine> at PCM, C-27 at intermediate connector, B-41 Park/Neutral position switch connector and C-43 at combination meter for damage.

Q: Are the connectors in good condition?
YES: Go to Step 7.
NO: Repair or replace the defective connector(s).

STEP 7. Check harness for open circuit, short circuit to ground and damage between combination meter connector C-43 terminal 9 and PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> terminal 121.

Q: Is the harness wire in good condition?
YES: Go to Step 8.
NO: Repair it.

STEP 8. Check harness for damage between combination meter connector C-43 terminal 12 and the ground.

Q: Is the harness wire in good condition?
YES: Go to Step 9.
NO: Repair it.

STEP 9. Check connector B-41 at Park/Neutral position switch for damage.

Q: Is the connector in good condition?
YES: Go to Step 10.
NO: Repair or replace it.

STEP 10. Check harness for short circuit to ground between combination meter connector C-43 terminal 9 and Park/Neutral position switch connector B-41 terminal 4.

Q: Is the harness wire in good condition?
YES: Go to Step 11.
NO: Repair it.

STEP 11. Using scan tool MB991502, check the light bulb.

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.