injector number (INJ 1, INJ 2 etc.) of its correspond-
ing fuel injector and cylinder number.
(18) Verify harness connectors are firmly con-
nected to idle air control (IAC) motor, throttle posi-
tion sensor (TPS) and manifold absolute pressure
(MAP) sensor (Fig. 8).
(19) Verify wire harness connector is firmly con-
nected to engine coolant temperature sensor (Fig.
10).
(20) Raise and support vehicle.
(21) Verify both upstream and downstream oxygen
sensor wire connectors are firmly connected to sen-
sors. Inspect sensors and connectors for damage (Fig.
11) or (Fig. 12).
(22) Inspect for pinched or leaking fuel tubes.
Inspect for pinched, cracked or leaking fuel hoses.
Fig. 8 Sensor and IAC Motor Location—Typical (V-8
Shown)
1 – MAP SENSOR
2 – IDLE AIR CONTROL MOTOR
3 – THROTTLE POSITION SENSOR
Fig. 9 Rubber L-Shaped Fitting—MAP Sensor-to-
Throttle Body
1 – MAP SENSOR
2 – RUBBER FITTING
3 – IDLE AIR PASSAGE
Fig. 10 Engine Coolant Temperature Sensor
1 – GENERATOR
2 – A/C COMPRESSOR
3 – ENGINE COOLANT TEMPERATURE SENSOR
4 – ELEC. CONN.
Fig. 11 Upstream Oxygen Sensor
1 – EXHAUST PIPE
2 – UPSTREAM OXYGEN SENSOR
DN FUEL SYSTEM 14 - 41
DIAGNOSIS AND TESTING (Continued)
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