MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-499
STEP 7. Check the power supply voltage at fuel pump relay
connector A-20X.
(1) Disconnect the connector A-20X and measure at the
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 3, 4 and ground.
•
Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Go to Step 8.
NO : Check harness connectors C-07, C-89 and C-101 at
intermediate connector for damage, and repair or
replace as required. Refer to, GROUP 00E, Harness
Connector Inspection (
P.00E-2
). If intermediate
connectors are in good condition, repair harness wire
between ignition switch connector C-87 terminal 2
and fuel pump relay connector A-20X terminal 3, 4
because of open circuit. Then confirm that the
malfunction symptom is eliminated.
STEP 8. Check for open circuit and short circuit to ground
and harness damage between fuel pump relay connector
A-20X terminal 1 and fuel pump connector D-17 terminal 5.
NOTE: Check harness after checking intermediate connectors
C-28 and C-90. If intermediate connectors are damaged, repair
or replace them. After to GROUP 00E, Harness Connector
Inspection (
P.00E-2
). Then check that the malfunction is
eliminated.
Q: Is the harness wire in good condition?
YES : Go to Step 9.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
AKX01441
A-20X HARNESS
SIDE CONNECTOR
1
2
3
4
AC
AK000360AB
CONNECTOR : A-20X
AK000734AC
CONNECTOR:D-17