|P000B – Exhaust B Camshaft Position Slow Response Bank 1|
|Description: The powertrain control module (PCM) monitors and evaluates the response of the actual position on a target position change. The setpoint and camshaft position are saved at the beginning of a setpoint change. If this change over time is large enough (gradient), the camshaft phasing change is evaluated. If the change after the diagnostic time is smaller than a threshold, a slow response is detected, and if the value is greater, then there is no concern. By detecting a concern, an antibounce counter is incremented otherwise the counter is decremented. If the counter exceeds an adjustable limit, this DTC sets.
Possible Causes: • Erratic camshaft position due to low oil pressure
• Oil flow restriction in the oil passages or the variable camshaft timing (VCT) valve body
• Camshaft advance mechanism binding (VCT unit)
• Damaged VCT phaser
• Radio frequency interference (RFI)
Diagnostic Aids: These DTCs may be accompanied by other DTCs. Diagnose all CMP sensor DTCs first. If no CMP sensor related DTCs are present, continue to follow diagnosis for the DTC.
This DTC is a functional check of the VCT unit. Diagnose any base engine concerns related to the engine oil pressure or engine timing. Refer to the Workshop Manual Section 303-00, Engine System, Oil Pressure Test, to check the engine oil pressure. Refer to the Workshop Manual Section 303-01, Engine, Timing Drive Components, to check the engine timing and VCT phasers.