P1236

: P1236; NO FUEL PUMP COMMANDS RECEIVED BY THE ECM

G251562t17 : CHECK THE ECM TO REM DRIVE CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the battery negative terminal.
2. Disconnect the ECM electrical connector, PI01.
3. Disconnect the REM electrical connector, CR11.
4. Measure the resistance between PI01, pin 27 (WR) and CR11, pin 19 (N).

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. CLEAR the DTC. TEST the system for normal operation.

-> No

G251562t18 : CHECK THE ECM TO REM DRIVE CIRCUIT FOR SHORT TO GROUND
1. Reconnect the battery negative terminal.
2. Measure the resistance between PI01, pin 27 (WR) and GROUND.

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> No

G251562t19 : CHECK THE ECM TO REM DRIVE CIRCUIT FOR SHORT TO B+
1. Measure the voltage between PI01, pin 27 (WR) and GROUND.

- Is the voltage greater than 3 volts?

-> Yes
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> No
Contact dealer technical support for advice on possible REM failure.