Workshop Manual

6E–499
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P1639 Reference Voltage # 2 Circuit Fault
Step Action Value(s) Yes No
1 Was the “On-Board (OBD) System Check” performed?
— Go to Step 2
Go to OBD
System
Check
2 1. Ignition “ON”, engine not running.
2. Using a DVM at the PCM side of the connector,
check the voltage at terminal S36 (BLK) pin.
Is the voltage in specified range?
4.95 – 5.0V
Go to ETC
System
Check
Go to Step 3
3 1. Ignition “ON”, engine not running.
2. Using a DVM at the PCM side of the connector,
check the voltage at terminal F20(RED/WHT) pin.
Is the voltage in specified range?
11.6 – 12.7V Go to Step 4 Go to Step 5
4 1. Ignition “ON”, engine not running.
2. Using a DVM at the PCM side of the connector,
check the voltage at terminal F57 (RED/WHT) pin.
Is the voltage in specified range?
11.6 – 12.7V Go to Step 6 Go to Step 5
5 Observe the battery voltage and circuit.
If a problem is found, repair it as necessary.
Was the problem found?
— Verify repair Go to Step 6
6 Replace the PCM.
IMPORTANT:
The replacement PCM must be programmed. Refer to
ON-Vehicle Service in Power Control Module and
Sensors for procedures.
And also refer to latest Service Bulletin. Check to see if
the latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
— Verify repair —