:  Dec 17, 2007



Overview

For additional information on the operation of the evaporative emissions systems, refer to the relevant workshop manual section.

Inspection and Verification

. Verify the customer concern.
  Note that there are a number of systems on the vehicle which will communicate with the message center, giving the driver information useful in diagnosing the fault
Note that there are a number of systems on the vehicle which will communicate with the message center, giving the driver information useful in diagnosing the fault

. Visually inspect for obvious signs of mechanical or electrical damage.

Mechanical Electrical
  • Fuel filler cap and seal
  • Fuel filler neck
  • DMTL fresh air filter (restriction, etc)
  • Fuel tank (leaks, damage, etc)
  • Fuel lines and joints, etc
  • Carbon canister
  • Purge valve
  • DMTL pump module
  • Fuses
  • Connectors
  • Harness(es)
  • Purge valve
  • DMTL pump

. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

. Use the approved diagnostic system or a scan tool to retrieve any DTCs before moving onto the symptom chart or DTC index.
  Make sure that all DTCs are cleared following rectification.
Make sure that all DTCs are cleared following rectification.

Symptom Chart

:
  For a more comprehensive symptom chart, refer to workshop manual section 303-14 - Electronic Engine Controls.

Symptom Possible source Action
Engine cranks and fires, but will not start
  • EVAP purge valve
  • Fuel system
  • Spark plugs
  • Ignition coil failure(s)
For purge valve tests refer to the guided diagnostic routine on the approved diagnostic system. For fuel system tests and ignition system tests, refer to the relevant workshop manual section.
Difficult to start cold
  • Check coolant anti-freeze content
  • Battery
  • Crankshaft position (CKP) sensor
  • Fuel system
  • EVAP purge valve
Check the coolant condition. For battery information, CKP sensor tests and fuel system tests, refer to the relevant workshop manual section. For purge valve tests refer to the guided diagnostic routine on the approved diagnostic system.
Difficult to start hot
  • Injector leak
  • Fuel system
  • Fuel temperature sensor
  • Intake air temperature (IAT) sensor
  • Mass air flow (MAF) sensor
  • EVAP purge valve
  • Ignition system
For injector and fuel system tests, fuel temperature sensor, IAT sensor, MAF sensor tests and ignition system tests, refer to the relevant workshop manual section. For purge valve tests refer to the guided diagnostic routine on the approved diagnostic system.
Difficult to start after hot soak (vehicle standing after engine has reached operating temperature)
  • Injector leak
  • Fuel system
  • Fuel temperature sensor
  • IAT sensor
  • MAF sensor
  • EVAP purge valve
  • Ignition system
For injector and fuel system tests, fuel temperature sensor, IAT sensor, MAF sensor tests and ignition system tests, refer to the relevant workshop manual section. For purge valve tests refer to the guided diagnostic routine on the approved diagnostic system.

DTC index

:
  Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5 digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last 2 digits give extra information read by the manufacturer-approved diagnostic system).

:
  For a full list of ECM DTCs, refer to workshop manual section 303-14 - Electronic Engine Controls.

DTC Description Possible source Action
P044100 Evaporative Emission System Incorrect Purge Flow
  • Evaporative emission (EVAP) canister purge valve pipe restricted/leaking
  • Canister vent restricted
  • Purge valve failure
Check the charcoal canister pipework and vent for integrity. Refer to the relevant workshop manual section.
P044200 Evaporative Emission System Leak Detected (small leak)
  • Fuel filler cap not correctly installed
  • Fuel filler cap seal faulty
  • Evaporative emission system leak (canister, pipes, etc)
  • Fuel tank leak
  • Canister dynamic monitoring of tank leakage (DMTL) valve fault
Refer to the relevant workshop manual section.
P044700 Evaporative Emission System Vent Control Circuit Open
  • EVAP DMTL valve circuit short circuit to ground
Refer to the electrical guides and check the DMTL valve circuit. Repair/renew as necessary. Refer to the relevant workshop manual section.
P044800 Evaporative Emission System Vent Control Circuit Shorted
  • EVAP DMTL valve circuit short circuit to power
Refer to the electrical guides and check the DMTL valve circuit. Repair/renew as necessary. Refer to the relevant workshop manual section.
P045500 Evaporative Emission System Leak Detected (gross leak/no flow)
  • Fuel filler cap not installed
  • Fuel filler cap seal faulty/missing
  • Evaporative emission system leak (canister, pipes, etc)
  • Fuel tank leak
  • DMTL valve fault
Check the fuel filler cap and seal, check the canister, pipes, etc. Check the fuel tank for leaks, etc. Refer to the relevant workshop manual section.
P045800 Evaporative Emission System Purge Control Valve Circuit Low
  • Purge valve control circuit short circuit to ground
  • Purge valve control circuit high resistance
  • EVAP canister purge valve failure
Refer to the electrical guides and check the DMTL valve circuit. Repair/renew as necessary. Refer to the relevant workshop manual section. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P045900 Evaporative Emission System Purge Control Valve Circuit High
  • Purge valve control circuit short circuit to power
Refer to the electrical guides and check the DMTL valve circuit. Repair/renew as necessary. Refer to the relevant workshop manual section. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P240100 Evaporative Emission System Leak Detection Pump Control Circuit Low
  • Diagnostic monitoring of tank leaks (DMTL) pump circuit(s) short circuit to ground
  • DMTL pump circuit(s) high resistance
Refer to the electrical guides and check the wiring between the ECM and DMTL pump. Repair as necessary.
P240200 Evaporative Emission System Leak Detection Pump Control Circuit High
  • DMTL pump circuit(s) short circuit to power
Refer to the electrical guides and check the wiring between the ECM and DMTL pump. Repair as necessary.
P240429 Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance
  • DMTL reference leak
Check the evaporative emission system for serviceability and leaks. Check the DMTL pump and circuits. Refer to the electrical guides. Complete a DMTL test. Refer to the relevant workshop manual section.
P24042F Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance
  • DMTL signal erratic
Check the DMTL pump and circuits. Refer to the electrical guides. Refer to the relevant workshop manual section.
P240500 Evaporative Emission System Leak Detection Pump Sense Circuit Low
  • DMTL pump circuit reference circuit low
Refer to the electrical guides and check the wiring between the ECM and DMTL pump. Repair as necessary.
P240600 Evaporative Emission System Leak Detection Pump Sense Circuit High
  • DMTL pump circuit reference circuit high
Refer to the electrical guides and check the wiring between the ECM and DMTL pump. Repair as necessary.
P240B00 Evaporative Emission System Leak Detection Pump Heater Circuit Low
  • DMTL heater control circuit low
Refer to the electrical guides and check the wiring between the ECM and DMTL pump. Repair as necessary.
P240C00 Evaporative Emission System Leak Detection Pump Heater Circuit High
  • DMTL heater control circuit high
Refer to the electrical guides and check the wiring between the ECM and DMTL pump. Repair as necessary.
P245000 Evaporative Emission Control System Switching Valve Performance/Stuck Open
  • DMTL pump circuit short circuit, high resistance
  • DMTL change over valve failed
Refer to the electrical guides and check the wiring between the ECM and DMTL valve. Repair/renew as necessary. Refer to the relevant workshop manual section.
P245100 Evaporative Emission Control System Switching Valve Stuck Closed
  • DMTL pump circuit short circuit, high resistance
  • DMTL change over valve failed
Refer to the electrical guides and check the wiring between the ECM and DMTL valve. Repair/renew as necessary. Refer to the relevant workshop manual section.