Jeep 1987 Wrangler Workshop Manual page 1526

m G
THROTTLE
BODY FUEL INJECTION SYSTEM
/ • % G
m G
1.4L 1983-1985
/ • % G
TROUSLE
CODE/CONDITION
POSSIBLE CAUSE
CORRECTION
No start signal voltage.
Check the start signal (voltmeter
from D1 Pin 4 to ground should
indicate battery voltage when
the starter motor is engaged.
Service the starter motor relay or
wire harness.
ISC motor plunger is not extended.
Coolant temperature sensor
inoperative.
Refer to the ISC motor test
procedure.
Refer to the coolant temperature
sensor test procedure.
Perform the self-diagnostic test.
Check to ensure that the spark
plugs are not fouled or wet.
Replace as necessary.
Engine starts but will not idle.
Fuel pump inoperative. Check the fuel pump.
Ignition system malfunction. Check the ignition system.
Repair as necessary.
Check the start signal after
engaging the starter motor.
Voltmeter from D1 Pin 4 to D1
Pin 3 should indicate zero volts.
Repair wire harness as
necessary.
Check the MAP sensor. Repair
as necessary.
Test the E C U with MS 1700
tester.
Driveability or fuel economy
complaint.
High fuel pressure.
Perform the self-diagnostic test.
Refer to the trouble codes.
Check the fuel pressure.
Test the E C U with MS 1700
tester.
Replace the ECU if necessary.
Check to determine if the
oxygen sensor is functioning.
Replace if necessary.
Injector defective.
Replace the injector.
WOT switch malfunction.
Check the WOT switch.
Adjust, repair or replace the
switch to ensure that the WOT
voltage (D2 Pin 6) is low during
an actual wide open throttle
condition.
85430G
54