98
4. Select DC Voltage on the tester and turn the ignition
switch to the ON position.
5. Connect the black tester lead to the black/green wire
and the red tester lead to the orange wire. The meter
should read battery voltage. If the meter does not
read as specified, check the wiring.
NOTE: When testing the resistance of the sensor’s
heater, the engine/exhaust pipe must be at room tem-
perature (65-75° F) or inaccurate readings will occur.
CAM POSITION SENSOR
The cam position sensor is located on the cylinder head.
1. Remove the access panel.
2. Remove the sensor from the cylinder head, but do
not disconnect from the wiring harness.
WT405E
NOTE: For this test, MaxiClips must be used.
3. Select DC Voltage on the tester and turn the ignition
switch to the ON position.
4. On the harness side, connect the black tester lead to
the black wire (ground) and the red tester lead to the
blue wire. The meter should read battery voltage. If
not, check the wiring.
5. Use a flat, metal apparatus (or open-ended wrench)
to contact the entire surface of the sensor. Typical
meter reading is 0.8 volts. If not, the sensor must be
replaced.
TEMPERATURE/MANIFOLD AIR
PRESSURE (TMAP) SENSOR
NOTE: Preliminary checks may be performed on
this component using the diagnostic mode on the LCD
gauge (see EFI Diagnostic System in this section).
NOTE: The ambient temperature of the engine and
in the intake and exhaust system must be at room
temperature (approximately 68° F) when performing
this test or an incorrect reading will occur.
1. Disconnect the sensor connector from the sensor
located on top of the throttle body.
2. Select DC Voltage on the tester and turn the ignition
switch to the ON position.
3. Connect the black tester lead to the pink/black wire
and the red tester lead to the green/black wire. The
meter should read 4.5-5.5 DC volts. If the meter does
not read as specified, check the ECM connector or
wiring.
4. Connect the sensor to the harness; then using Maxi-
Clips, connect the red tester lead to the brown/white
wire and the black tester lead to the pink/black wire.
With the engine running at idle speed, the meter
should read approximately 2.5 DC volts.
5. Connect the red tester lead to the green/red wire.
With the engine at idle and at room temperature
(approximately 68° F), the meter should read
approximately 2.9 DC volts.
NOTE: If the meter does not read as specified,
replace the sensor.
ENGINE COOLANT TEMPERATURE
(ECT) SENSOR
NOTE: Preliminary checks may be performed on
this component using the diagnostic mode on the LCD
gauge (see EFI Diagnostic System in this section).
1. Connect the meter leads (selector in OHMS position)
to the sensor terminals.
2. Suspend the sensor and a thermometer in a container
of cooking oil; then heat the oil.
NOTE: Neither the sensor nor the thermometer
should be allowed to touch the bottom of the con-
tainer or inaccurate readings will occur. Use wire
holders to suspend the sensor and thermometer.
3. On the ECT sensor when the temperature reaches
60° C (140° F), the meter should read approximately
703 ohms ± 5%.
4. On the ECT sensor when the temperature reaches
90° C (194° F), the meter should read approximately
260 ohms ± 5%.
5. On the ECT sensor when temperature reaches 120° C
(248° F), the meter should read approximately 111
ohms ± 5%.
6. If the readings are not as indicated, the sensor must
be replaced.
7. Install the sensor and tighten securely.
8. Connect the leads.
Component data can be retrieved using the CATT II. Uti-
lize the Sensor Data screen.
Component data can be retrieved using the CATT II. Uti-
lize the Sensor Data screen.
! WARNING
Wear insulated gloves and safety glasses. Heated oil
can cause severe burns.