STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE: 54
J1587 CODE:
P84 12 · VEHICLE SPEED SENSOR FAULT
54-7
Check ECM Connectors
Check terminals at ECM vehicle
Terminals and
Reprogram ECM. Then go to
harness connector (both ECM
connectors are okay.
54-30.
and harness side) for damage;
bent, corroded and unseated pins
Problem found.
Repair terminals/connectors.
or sockets.
Then go to 54-30.
54-8
Vehicle Speed
Mechanical Checks
Check for plugged fuel filters (See
Okay.
Go to 54-5.
note below).
Check if any metal, etc., is lodged
Not okay.
Repair. Then go to 54-30.
between the VSS and pulse
wheel.
Check if sensor is loose.
Make sure VSS pulse wheel is in
fixed position relative to magnetic
pickup.
Check for proper air gap between
magnetic pickup and pulse wheel.
54-9
Check for Short to
Ground
Turn ignition off.
Less than or
VSS signal line (ckt #556) and/or
Disconnect the ECM vehicle
equal to 100 ohms
(ckt #557) is shorted to
ground.
harness connector.
Repair short.
Then go to 54-30.
Read resistance between socket
E2 (ckt #556) and a good ground
Greater than
Go to 54-10.
100 ohms or open.
NOTE:
Plugged fuel filters result in low fuel pressure. Under this condition, a high pulse width reading at
engine speeds above 1500 rpm in a stationary vehicle can cause the logging of Code 54.
Change 3 3-345.357
