Troubleshooting

RENR2696-01 219
Troubleshooting Section
g00977350
Illustrat
ion 128
A. Turn the keyswitch to the OFF position.
B. Disconnect ECM connector J1/P1 and remove
the wire for the suspect throttle input from ECM
connecto
rP1.
C. Reconnect all connectors.
D. Turn the keyswitch to the ON position.
E. Observe t
he status of the suspect throttle input on
the electronic service tool.
F. Turn the k
eyswitch to the OFF position.
G. Disconnect ECM connector J1/P1 and remove the
wire fro
mP1:37SwitchReturn.
H. Fabricateajumperwirewithpinsatbothends.
Insert t
he jumper wire at P1:37 Switch Return and
the suspect throttle input at ECM connector P1.
I. Reconne
ct all connectors.
J. Turn the keyswitch to the ON position.
Note: Additional diagnostic codes will be generated
because P1:37 Digital Return will no longer be
connect
ed to other sensors and switches. Ignore the
codes and clear the codes when you complete this
test.
K. Observe the status of the suspect throttle input on
the elect
ronic service tool.
L. Turn the keyswitch to the OFF position.
M. Remove the jumper wire from ECM connector P1
and reconnect all wires and connectors.
Expected Result:
The statu
s of the suspect throttle input should be
“OFF” when the jumper wire is not installed. The
status should be “ON” when the jumper wire is
install
ed.
Results:
•
OK – There is a problem in the harness between
the ECM a nd the throttle switch.
Repair: Repair the circuit.
Verify t
hat the repair eliminates the problem.
STOP.
•
Not OK – The switch signal appears at the ECM.
The ECM is not reading the switch properly.