2010 Cadillac Truck SRX FWD V6-3.0L Page 1476
Circuit/System Verification
1. If DTC P0340, P0345, P0365, or P0390 are also set, diagnose those DTCs first
2. With the ignition OFF, inspect the engine wiring harnesses carrying the B23 camshaft position sensor circuits for the following conditions:
* Close routing of aftermarket electrical equipment
* Close to solenoids, motors, and relays
瀚慍orrect any wire harness routing or component placement conditions if it is determined to be a possible source of electrical interference.
3. Observe the following scan tool parameters are all incrementing:
* Exhaust Camshaft Position Active Counter Bank 1
* Intake Camshaft Position Active Counter Bank 1
* Exhaust Camshaft Position Active Counter Bank 2
* Intake Camshaft Position Active Counter Bank 2
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Engine idling, move the related harnesses/connectors of the B23 camshaft position sensor while monitoring the scan tool Camshaft Position
Variance parameter. The Camshaft Position Variance parameter should not change when moving the harness/connectors.
瀚慖f the above condition exists, repair the harness/connectors as necessary.
2. Ignition OFF, inspect the B23 camshaft position sensor for correct installation.
瀚慖f the B23 camshaft position sensor is loose, inspect the sensor and the O-ring for damage and replace as necessary.
3. Disconnect the harness connector at the B23 camshaft position sensor.
4. Ignition OFF, all vehicle systems OFF, this may take 2 minutes, test for less than 5 ohm between the low reference circuit terminal B and
ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20
ECM.
5. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground.
瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground, or an open/high resistance. If the circuit tests normal,
replace the K20 ECM.
瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
6. Test for 4.8-5.2 V between the signal circuit terminal C and ground.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the K20 ECM.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
7. Ignition OFF, connect a 3 A fused jumper wire to the camshaft position signal circuit terminal C.
8. Ignition ON, momentarily touch the end of the fused jumper wire to ground while monitoring the scan tool camshaft position active counter.
The camshaft position active counter should increment.
瀚慖f the camshaft position active counter does not increment, replace the K20 ECM.
9. If all circuits test normal, replace the B23 camshaft position sensor.
Component Testing
Note: You must perform the Circuit/System Testing before proceeding with Component Testing.
1. Inspect the B23 camshaft position sensor for looseness and correct installation. Remove the camshaft position sensor from the engine and
inspect the sensor and the O-ring for damage.
瀚慖f the sensor is loose, incorrectly installed, or damaged, repair or replace the B23 crankshaft position sensor.
2. Connect the camshaft position sensor connector to the camshaft position sensor. Turn ON the ignition, with the engine OFF.
3. Ignition ON, observe the applicable camshaft position active counter parameter with a scan tool. Pass a steel object by the tip of the sensor
