P1336 - Crankshaft/Camshaft Sensor Range/Performance

4-108 Powertrain DTC Charts and Descriptions

Diagnostic Trouble Code (DTC) Charts and Descriptions

P1336 - Crankshaft/Camshaft Sensor Range/Performance

Description: This DTC sets when the input signal from the crankshaft position (CKP) sensor or the camshaft position (CMP)

sensor is erratic.

Possible Causes: • Damaged CKP sensor

• Damaged CMP sensor

• Base engine concerns

• Harness concerns

Diagnostic Aids: Check the harness for routing, alterations, incorrect shielding, or electrical interference from other systems.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test JD.

P1397 - System Voltage Out Of Self -Test Range

Description: This DTC sets when the 12-volt system voltage is too high or too low during the key ON engine OFF (KOEO) or

key ON engine running (KOER) self-test. It sets if the system voltage falls below or exceeds the calibrated threshold at any time during the KOEO or KOER self-test.

Possible Causes: • Battery or charging system concern

Diagnostic Aids: Make sure the battery voltage is between 11 and 18 volts before running a KOEO or KOER self-test. Refer to

the Workshop Manual Section 303-14, Electronic Engine Controls.

Application Key On Engine Off Key On Engine Running Continuous Memory

All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.

P1408 - Exhaust Gas Recirculation (EGR) Flow Out Of Self-Test Range

Description: This test is carried out during the key ON, engine running (KOER) on demand self-test only. The EGR system is

commanded on at a fixed engine speed. This DTC sets when the measured EGR flow falls above or below the required calibration.

Possible Causes: • For electric EGR (EEGR) system,

• EEGR valve stuck open or closed

• EEGR connector not seated correctly

• EEGR stepper motor

• VPWR circuit open

• EGRMC circuit open

• EGRMC circuit short to voltage

• EGRMC circuit short to ground

• Vacuum signal to manifold absolute pressure (MAP) sensor restricted or leaking

• Mass airflow (MAF) sensor signal erroneous

• Carbon build up in the EEGR valve seat area

Diagnostic Aids: Use the output state control function of the scan tool and monitor the MAP and the EGRMDSD PIDs while

commanding the EEGR on. If EGR is introduced into the engine at idle, the RPM drops or stalls out.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test KD.

P144A - Evaporative Emission System Purge Vapor Line Restricted/Blocked

Description: The PCM monitors the evaporative emission (EVAP) system for a restricted fuel vapor tube between the fuel

tank pressure (FTP) sensor and the fuel tank. During the initial phase of the EVAP monitor, the PCM closes the canister vent and a vacuum develops in the fuel vapor tubes and lines and in the fuel tank. The PCM monitors the FTP sensor to determine the amount of vacuum and how quickly the vacuum increases. The rate at which the vacuum increases is compared to an expected value. If the vacuum increases quicker than expected, a restricted fuel vapor tube is suspected and an intrusive test is carried out in the final phase of the EVAP monitor. This DTC sets when the intrusive test confirms a blockage a counter is incremented and the counter reaches a calibrated number of completions.

Possible Causes: • Restricted fuel vapor tube between the FTP sensor and the fuel tank

• EVAP purge valve stuck partially open

Diagnostic Aids: Check the fuel vapor tube for blockage between the FTP sensor and the fuel tank.

Application Key On Engine Off Key On Engine Running Continuous Memory

2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015