4.16
FUEL INJECTION
CPS Test
The crankshaft position sensor is a sealed, non-serviceable
assembly. If fault code diagnosis indicates a problem within this
area, test and correct as follows:
1. Disconnect main harness connector from ECU.
2. Connect an ohmmeter between the pin terminals. A
resistance value of 560  10% at room temperature (20
î™±
C, 68î™± F) should be obtained. If resistance is correct, check
the mounting, air gap, toothed ring gear (damage, runout,
etc.), and flywheel key.
3. Disconnect speed sensor connector from wiring harness.
(the connector with one heavy black lead) Viewing the
connector with dual aligning rails on top, test resistance
between the terminals. A reading of 560  10% should
again be obtained.
NOTE: If the resistance is incorrect, remove the
screw securing the sensor to the mounting bracket
and replace the sensor. If the resistance in step 2
was incorrect, but the resistance of the sensor alone
was correct, test the main harness circuit between
the sensor connector terminals and the
corresponding pin terminals in the main connector.
Correct any observed problem, reconnect the
sensor, and perform step 2 again.
CPS Replacement
1. Disconnect sensor harness connector.
2. Using a 6 mm hex wrench, remove the retaining bolt and
replace the sensor, using a light coating of oil on the o-ring
to aid installation.
3. Torque the retaining bolt to specification.
TEMPERATURE / BAROMETRIC AIR
PRESSURE SENSOR (T-BAP)
Operation Overview
Mounted on the throttle body intake, the temperature and
barometric air pressure sensor (T-BAP) performs two functions
in one unit.
Air passing through the intake is measured by the T-BAP and
relayed to the ECU. These signals, comprised of separate air
temperature and barometric air pressure readings, are processed
by the ECU and compared to it's programming for determining
the fuel and ignition requirements during operation.
T-BAP Test
The temperature and barometric air pressure sensor (T-BAP) is
a non-serviceable item. If it is faulty, it must be replaced. This
sensor requires a 5 Vdc input to operate, therefore the T-BAP
sensor should only be tested using the Digital Wrenchâ„¢
Diagnostic Software (dealer only). Refer to the EFI Diagnostic
Software Manual for more information.
T-BAP Replacement
1. Disconnect sensor from engine harness.
2. Using a 10mm wrench, remove the retaining bolt and
replace the sensor, using a light coating of oil on the o-ring
to aid installation.
3. Torque the retaining bolt to specification.
Crankshaft Position Sensor:
560  10% (20 C, 68 F)
= T
CPS Retaining Bolt Torque:
25 in. lbs. (2.8 Nm)
= T
T-BAP Retaining Bolt Torque:
29 in. lbs. (3.3 Nm)
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