Ford Excursion, Expedition, Lincoln Navigator 2000-2005

6.8L V10 VIN S Auto 6

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Trouble Code: P1285



Cylinder Head Over-Temperature Sensed

Possible Causes:



Base engine problems or related concerns
 
CHT sensor has deteriorated or it has failed
 
Engine coolant level is too low
 
Engine cooling system has a problem
 
TSB 10-29-1 contains repair help for this code (LS & T-Bird)
 

Trouble Code: P1288



Cylinder Head Temperature Sensor Out of Self-Test Range

Possible Causes:



CHT sensor harness connector is damaged
 
CHT sensor is damaged
 
Engine coolant level is too low
 
Engine is cold, or the engine is overheated
 

Trouble Code: P1289



Cylinder Head Temperature Sensor Circuit High Input

Possible Causes:



CHT sensor circuit is open in the wiring harness, or an open circuit exists in the CHT sensor circuit at the harness connector
 
CHT sensor is damaged or has failed
 
Engine coolant level is too low or the thermostat has failed
 
PCM has failed
 

Trouble Code: P1290



Cylinder Head Temperature Sensor Circuit Low Input

Possible Causes:



CHT sensor connector is damaged or a short circuit exists
 
CHT sensor signal circuit is shorted to sensor ground
 
CHT sensor is damaged or the PCM has failed
 

Trouble Code: P1299



Cylinder Head Over-Temperature Protection Active

Possible Causes:



Cooling system has a problem
 
Engine coolant level is too low
 
A Base Engine problem may be present
 
TSB 10-29-1 contains repair help for this code (LS & T-Bird)
 

Trouble Code: P1309



Misfire Monitor Disabled

Possible Causes:



Camshaft position sensor is damaged or it has failed
 
CKP, ECT or MAF sensors may be out-of-calibration or failed
 
PCM has failed
 
TSB 02-22-1 contains repair information for this trouble code
 

Trouble Code: P1336



CKP or CMP Signal Malfunction

Possible Causes:



Base Engine problem or concern exists
 
CKP sensor or CMP signal circuit is open or shorted to ground
 
CKP sensor or CMP sensor is damaged or failed (check for EMI/RFI on this circuit).
 
PCM has failed
 
TSB 02-22-1 contains repair information for this trouble code
 

Trouble Code: P1351



Ignition Diagnostic Monitor Circuit Malfunction

Possible Causes:



Camshaft position sensor may have failed
 
IDM signal circuit may be open or grounded
 
CKP, ECT or MAF sensors may be damaged or have failed
 
PCM has failed
 

Trouble Code: P1356



PIP Signals Present With Engine Off

Possible Causes:



Ignition Module has failed
 
PCM has failed
 

Trouble Code: P1358



IDM Signals Out Of Self-Test Range

Possible Causes:



Ignition Module has failed
 
PCM has failed
 

Trouble Code: P1359



Spark Output Circuit Malfunction

Possible Causes:



SPOUT signal circuit may be open (check the connector)
 
SPOUT signal circuit may be grounded
 
Ignition Module is damaged or has failed
 

Trouble Code: P1390



Octane Adjust Circuit Malfunction

Possible Causes:



OCT shorting bar removed
 
OCT circuit open
 
PCM has failed
 

Trouble Code: P1400



DPFE Sensor Circuit Low Input

Possible Causes:



DPF EGR signal circuit shorted to ground
 
DPF EGR signal VREF circuit open
 
DPF EGR sensor is damaged or has failed
 
PCM has failed
 
TSB 4-3-1 contains repair information for this trouble code
 

Trouble Code: P1401



DPFE Sensor Circuit High Input

Possible Causes:



DPF EGR signal circuit open, or sensor ground circuit open
 
DPF EGR signal shorted to VREF or to power
 
DPF EGR sensor is damaged or has failed
 
PCM has failed
 
TSB 4-3-1 contains repair information for this trouble code
 

Trouble Code: P1405



DPFE Sensor Upstream Hose Off Or Plugged

Possible Causes:



DPF EGR sensor upstream hose is disconnected
 
DPF EGR sensor upstream hose is plugged (ice)
 
EGR tube is plugged or damaged
 

Trouble Code: P1406



DPFE Sensor Downstream Hose Off Or Plugged

Possible Causes:



Check for signs of icing in the hose, or for a restricted tube
 
DPF EGR sensor downstream hose is disconnected
 
DPF EGR sensor downstream hose is plugged (ice)
 
EGR tube is plugged or damaged
 

Trouble Code: P1409



EGR Vacuum Regulator Solenoid Circuit Malfunction

Possible Causes:



EGR VR solenoid circuit is open, or shorted to ground
 
EGR VR circuit is shorted to power or the VPWR circuit is open
 
EGR vacuum regulator solenoid is damaged or the PCM has failed
 

Trouble Code: P1411



Secondary Air Injection System Downstream Flow

Possible Causes:



Secondary AIR System Electric Pump is damaged
 
Secondary AIR System Mechanical Pump is damaged
 
Secondary AIR pump hose is leaking
 
Secondary AIR pump hose is blocked
 
Secondary AIR Bypass solenoid passage leaking or blocked
 
Secondary AIR Bypass solenoid stuck open or stuck closed
 

Trouble Code: P1413



Secondary AIR System Monitor Circuit Low Input

Possible Causes:



AIR solenoid control circuit is open or it is shorted to ground
 
AIR pump is damaged or it has failed
 
Solid State relay is damaged or it has failed
 
Solid State relay battery power circuit (B+) is open
 
PCM has failed
 

Trouble Code: P1414



Secondary AIR System Monitor Circuit High Input

Possible Causes:



AIR Monitor circuit from the pump to the PCM is open
 
AIR solenoid control circuit is shorted to power
 
Solid State relay is damaged or has failed
 
AIR pump ground circuit is open
 
AIR pump is damaged or has failed
 
PCM has failed
 

Trouble Code: P1432



Thermostat Heater Control Circuit Malfunction

Possible Causes:



Thermostat Heater Control (THTRC) circuit open or shorted
 
Thermostat Heater Control (THTRC) VPWR circuit open
 
Thermostat Heater assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P1436



A/C Evaporator Temperature (ACET) Circuit Low Input

Possible Causes:



ACET signal circuit shorted to sensor ground (return)
 
ACET signal circuit shorted to chassis ground
 
ACET sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1437



A/C Evaporator Temperature (ACET) Circuit High Input

Possible Causes:



ACET signal circuit is open, or the ground circuit is open
 
ACET signal is shorted to VREF
 
ACET sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1442



EVAP System Small Leak (0.040") Detected

Possible Causes:



Fuel filler cap damaged, cross-threaded or loosely installed
 
Aftermarket EVAP parts that do not conform to specifications
 
Small holes or cuts in fuel vapor hoses or EVAP canister tubes
 
CV solenoid stays partially open when commanded closed
 
Loose fuel vapor hose/tube connections to EVAP components
 
EVAP component seals leaking (i.e., leaks in the Purge valve, fuel tank pressure sensor, canister vent solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve)
 
TSB 03-9-8 contains a repair procedure for this trouble code
 
TSB 3-20-3 contains a repair procedure for this trouble code
 

Trouble Code: P1443



EVAP Canister Purge System Malfunction

Possible Causes:



EVAP canister purge valve is damaged or has failed
 
PF sensor is out-of-calibration or it is "skewed"
 
PCM has failed
 

Trouble Code: P1444



Purge Flow Sensor Circuit Low Input

Possible Causes:



PF sensor signal circuit is shorted to sensor or chassis ground
 
PF sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1445



Purge Flow Sensor Circuit High Input

Possible Causes:



PF sensor signal circuit shorted to VREF or power (VPWR)
 
PF sensor signal circuit open or sensor ground circuit open
 
PF sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1450



Unable to Bleed Up Fuel Tank Vacuum

Possible Causes:



CV solenoid is stuck partially or fully open or filter is plugged
 
EVAP canister tube or EVAP canister purge outlet tube blocked or kinked between fuel tank, purge valve and EVAP canister
 
Fuel filler cap stuck closed (vacuum relief cannot occur)
 
Contaminated fuel vapor elbow at the EVAP canister, or the EVAP canister is restricted or canister purge valve stuck open
 

Trouble Code: P1451



EVAP System Canister Vent Solenoid Circuit Malfunction

Possible Causes:



CV solenoid circuit is open, shorted to ground or system power
 
CV solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1452



Fuel Tank Pressure Sensor Circuit Malfunction

Possible Causes:



FTP sensor signal circuit is open or shorted to ground
 
FTP sensor ground return circuit is open
 
FTP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1455



EVAP System Gross Leak Detected

Possible Causes:



Fuel filler cap missing, loose (not tightened) or the wrong part
 
FTP sensor signal circuit open or sensor ground circuit open
 
FTP sensor ground circuit open
 
FTP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1460



Wide Open Throttle A/C Cutout Relay Circuit Malfunction

Possible Causes:



WOT A/C Relay control circuit is open or shorted to ground
 
WOT A/C Relay VREF circuit is open
 
WOT A/C Relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1461



A/C Pressure Sensor Circuit High Input

Possible Causes:



ACP sensor circuit shorted to VREF or to power (VPWR)
 
ACP sensor circuit is open, or the ground circuit is open
 
ACP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1462



A/C Pressure Sensor Circuit Low Input

Possible Causes:



ACP sensor circuit shorted to VREF or to power (VPWR)
 
ACP sensor circuit is open, or the ground circuit is open
 
ACP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1463



A/C Pressure Sensor Insufficient Pressure Change

Possible Causes:



A/C system mechanical failure, or A/C clutch always engaged
 
ACP sensor signal open, or sensor ground circuit open
 
A/C sensor is damaged or the PCM has failed
 

Trouble Code: P1464



A/C Demand Out of Self-Test Range

Possible Causes:



A/C switch was left "on" during the KOER self-test
 
A/C PWR circuit is shorted to power (N/C WAC relay contacts)
 
ACCS circuit is shorted to power
 
A/C Demand Switch, WAC relay or CCRM is damaged
 

Trouble Code: P1469



Low A/C Cycling Period

Possible Causes:



Cycling pressure switch circuit open between pin 41 (ACCS) and the PCM, or the IGN RUN circuit is open to the cycling pressure switch circuit (if applicable)
 
Mechanical A/C system concern (i.e., low refrigerant charge, damaged A/C switch)
 

Trouble Code: P1473



Fan Secondary High with Fan(s) Off

Possible Causes:



Power-to-Cooling fan circuit open in the wiring harness
 
Power-to-Cooling fan circuit shorted to power in wiring harness
 
Cooling fan motor windings open, or fan ground circuit is open
 
VLCM is damaged or has failed
 

Trouble Code: P1474



Hydraulic Cooling Fan Primary Circuit Malfunction

Possible Causes:



FC circuit is open or shorted to power
 
LFC circuit is open or shorted to power (CCRM models)
 
FC or LFC relay VPWR circuit is open (Start/Run on Probe)
 

Trouble Code: P1477



Medium Fan Control Primary Circuit Malfunction

Possible Causes:



MFC circuit is open
 
MFC relay circuit to IGN START/RUN is open
 
MFC relay is damaged or has failed
 
PCM has failed
 

 
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