Impco HHI, Service Manual

Page: 461 / 485

461
TMAP Sensor
INSTALLATION PROCEDURE
1. Install the TMAP and torque the retaining
screw to 19 in.lbs. (2.1 Nm).
2. Reconnect the negative battery cable.
3. Start the vehicle and let run until it reaches
normal operating temperature.
4. If a DTC code is found, refer to the Electrical
Section for further diagnosis.
VII. ENGINE COOLANT TEMPERATURE
SENSOR (ECT)
REMOVAL PROCEDURE
1. Disconnect the negative battery cable.
2. Locate the Engine Coolant Temperature Sen-
sor on the back of the engine (opposite end of
the fan).
Location of the Water Temperature Sensor
3. Remove electrical connector.
4. Drain the cooling system.
5. Remove the sensor.
INSTALLATION PROCEDURE
1. Apply a minimal amount of Loctite 962T or
equivalent sealer to threads on the Engine Coo-
lant Temperature Sensor. Remove any excess
sealer on the sensor threads.
2. Install Engine Coolant Temperature Sensor.
Torque to 10.8-14.5 ft.lbs. (14.7-19.6 Nm).
3. Refill the cooling system.
4. Reconnect electrical connector.
5. Reconnect the negative battery cable.
6. Start the vehicle and let run until it reaches nor-
mal operating temperature.
7. If a DTC code is found, refer to the Electrical
Section for further diagnosis.
VIII. HEATED EXHAUST GAS OXYGEN SENSOR
(HEGO)
REPLACEMENT
1. Disconnect Negative battery cable.
2. Locate the affected Oxygen Sensor on the three
way catalytic converter/muffler assembly. There
are two sensors: one between the engine and
catalytic brick (upstream) and one between the
catalytic brick and tail pipe (downstream).
3. Disconnect the Oxygen sensor electrical connec-
tor.
HEGO and Connector
4. Using an Oxygen Sensor socket, remove the
Oxygen Sensor.
INSTALLATION PROCEDURE
IMPORTANT
Before install the Oxygen sensor lubricate threads
with anti-seize compound P/N 5613695 or equiva-
lent. Avoid contaminating sensor tip with
compound.