STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE:
87 (Cont'd)
J1587 CODE:
P73-4 PUMP PRESSURE CIRCUIT FAILED LOW- (Below)
P108-4 BAROMETRIC PRESSURE CIRCUIT FAILED LOW - (TBD)
87-8
Check for Short to +5
Volts
Turn ignition off.
Less than or
Go to 87-9.
Disconnect the vehicle harness
equal to 5 ohms.
connector at the ECM.
Install a jumper wire between
Greater than
The engine +5 Volt line
sockets A and C of the PGC
5 ohms or open.
(ckt #916) is open. Repair open.
sensor connector.
Then go to 87-30.
Read resistance between sockets
A3 and C3 on the engine harness
connector.
87-9
Check for Short
Remove jumper wire.
Less than or
The engine +5 Volt line
Read resistance between sockets
equal to 10,000 ohms.
(ckt #916) is shorted to the
A and C of the PGC sensor
return line (ckt #952). Repair
connector.
short. then go to 87-30.
Greater than
Go to 87-10.
10,000 ohms or open.
87-10
Replace PGC Sensor
Turn ignition off.
Check engine
Go to 87-7.
Replace PGC sensor.
light comes on.
Reconnect all connectors.
Turn ignition on.
Check engine
Go to 87-30.
Clear codes.
light does not
Start engine and attempt to run
come on.
PGC in "PRESSURE" mode for
one minute.
Change 3 3-345.407
