DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch ``OFF''.
2. Disconnect electronic fuel injection
pump harness connector.
3. Turn ignition switch ``ON''.
4. Check voltage between terminal
V1
and ground with CONSULT or tester.
Voltage:
Approximately 5V
OK
cNG
Repair harness or connec-
tors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Check harness continuity between ter-
minal
V5and engine ground.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
cNG
Check the following.
+Harness connectors
F6,M51
+Harness connectors
M88,E106
+Harness for open or
short between ECM and
electronic fuel injection
pump
+Harness for open or
short between TCM and
electronic fuel injection
pump
If NG, repair open circuit or
short to ground or short to
power in harness or con-
nectors.
CHECK COMPONENT
(Fuel temperature sensor).
Refer to ``COMPONENT INSPECTION''
on next page.
OK
cNG
Take proper action.
Disconnect and reconnect harness con-
nectors in the circuits. Then retest.
Trouble is not ®xed.
Check ECM pin terminals for damage and
check the connection of ECM harness
connector. Reconnect ECM harness con-
nector and retest.
INSPECTION END
SEF682VB
SEF769V
SEF770V
.
.
.
.
.
.
TROUBLE DIAGNOSIS FOR ``FUEL TEMP SENSOR'' (DTC 42)
Fuel Temperature Sensor (FTS) (Cont'd)
EC-137
Governor Cut Circuit
ON BOARD DIAGNOSIS LOGIC
This diagnostic procedure checks whether or not fuel cut is being performed during deceleration.
Signals from the accelerator switch and camshaft position sensor (PUMP) are sent to the ECM. The ECM uses
these signals to control the electric governor operation.
Accelerator switch (F/C)cAccelerator position
ECM
cElectric
governor
Camshaft position sensor (PUMP)cEngine speed
Diagnostic
Trouble Code
No.Malfunction is detected when ....Check Item
(Possible Cause)
48+Accelerator switch circuit is shorted.
+Crankshaft position sensor (PUMP) or ECM is mal-
functioning.+Harness or connectors
[Accelerator switch (F/C) and camshaft position sen-
sor (PUMP) circuits]
+Accelerator switch (F/C)
+Camshaft position sensor (PUMP)
+ECM
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
Note: If both DTC 48 and 11 or 23 are displayed, perform
TROUBLE DIAGNOSIS FOR DTC 11 or 23 (See EC-69 or
106).
1) Turn ignition switch ``ON''.
2) Select ``DATA MONITOR'' mode with CONSULT.
3) Start engine and run it to 3,000 rpm, then quickly release
accelerator pedal.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------OR-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Start engine and run it to 3,000 rpm, then quickly release
accelerator pedal.
2) Turn ignition switch ``OFF'', wait at least 5 seconds and
then turn ``ON''.
3) Perform ``Diagnostic Test Mode II (Self-diagnostic
results)''.
TROUBLE DIAGNOSIS FOR ``GOV CUT CIRCUIT'' (DTC 48)
EC-149
