P1601

DTC P1601: Communication Malfunction (between PCM and Throttle Actuator Control Unit)

CAUTION: If DTC P1601. has been set, TCL related DTC U1120 is also set After P1601. has been diagnosed, don't forget to erase DTC U1120.

TECHNICAL DESCRIPTION
- PCM checks the communication lines for abnormal conditions

DESCRIPTIONS OF MONITOR METHODS
Communication with throttle actuator control unit is impossible

MONITOR EXECUTION
Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored)
- Not applicable

Sensor (The sensor is determined to be normal)
- Not applicable

DTC SET CONDITIONS

Check Conditions
- Battery positive voltage is higher than 6.3 volts

Judgement Criteria
- PCM detects an error in communication with the throttle actuator control unit for 0.05 second.
- Throttle actuator control module detects an error in communication with the PCM for 0.125 second.

OBD-II DRIVE CYCLE PATTERN
None

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- PCM failed

DIAGNOSIS

Required Special Tools:
- MB991958: Scan tool (MUT-III Sub Assembly)
- MB991824: V.C.I
- MB991827: USB Cable
- MB991910: Main Harness A




STEP 1. Using scan tool MB991958, read the diagnostic trouble code (DTC).

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK"(OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. After the DTC has been deleted, read the DTC again.
4. Turn the ignition switch to the "LOCK"(OFF) position.

Q: Is DTC P01601 set?

YES: Replace the PCM

NO: It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points.