90-823225--1 10965E-72 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
Throttle Body Injection Fuel System Diagnosis (Continued)
Chart A-7 (5 of 6)
TO
SYSTEM
RELAY
FUEL PUMP
RELAY FUSE
15A
FUEL
PUMP
RELAY
A M B
FUEL PUMP
FUEL PUMP
RELAY DRIVER
J2-9
ECM
30
85
86
87
87a
902 RED 339 PNK/BLK
465 DK GRN/WHT
450 BLK/WHT450 BLK/WHT
120 GRY
150 BLK
TEST DESCRIPTION:
Number(s) below refer to circled number(s) on the
diagnostic chart.
1. This step checks if there is power to the fuel pump
relay.
2. Bypassing the relay circuit should cause the fuel
pump to run. This step should identify if the fault
is in the relay or in the fuel pump circuit.
3. This step checks if there is an open in the ground
circuit.
4. This step checks if the ECM is functioning proper-
ly.
To Next Page
Loading...
