Ford Escape Quiz
Powertrain

Diagnosis and Testing - Engine Temperature

In this manual: Powertrain
General Information — 26Chassis — 160Powertrain — 323Electrical — 356Body and Paint — 290
~9min read

Diagnostic Trouble Code (DTC) Chart

The diagnosis in this manual assumes a certain level of skill and knowledge of Ford-approved diagnostic procedures.
REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).


Module Trouble Code Description Action
PCM P0116:00 Engine Coolant Temperature Sensor 1 Circuit Range/Performance: no subtype information GO to Pinpoint Test DL
PCM P0119:00 Engine Coolant Temperature Sensor 1 Circuit Intermittent/Erratic: no subtype information GO to Pinpoint Test DL
PCM P017C:00 Cylinder Head Temperature Sensor 'A' Circuit Low: no subtype information GO to Pinpoint Test DL
PCM P017D:00 Cylinder Head Temperature Sensor 'A' Circuit High: no subtype information GO to Pinpoint Test DL
PCM P017E:00 Cylinder Head Temperature Sensor 'A' Circuit Intermittent/Erratic: no subtype information GO to Pinpoint Test DL
PCM P101F:00 Cylinder Head Temperature Sensor 1 Out of Self-Test Range: no subtype information GO to Pinpoint Test DL
PCM P1021:00 Cylinder Head Temperature Sensor 2 Circuit Range/Performance: no subtype information GO to Pinpoint Test DL
PCM P1022:00 Cylinder Head Temperature Sensor 2 Circuit Low: no subtype information GO to Pinpoint Test DL
PCM P1023:00 Cylinder Head Temperature Sensor 2 Circuit High: no subtype information GO to Pinpoint Test DL
PCM P1024:00 Cylinder Head Temperature Sensor 2 Circuit Intermittent/Erratic: no subtype information GO to Pinpoint Test DL
PCM P1025:00 Cylinder Head Temperature Sensor 2 Out of Self-Test Range: no subtype information GO to Pinpoint Test DL
PCM P1026:00 Engine Coolant Temperature Sensor 1 / Cylinder Head Temperature Sensor 2 Correlation: no subtype information GO to Pinpoint Test DL
PCM P1285:00 Cylinder Head Overheating Condition: no subtype information GO to Pinpoint Test DL
PCM P1288:00 Cylinder Head Temperature Sensor Out of Self-Test Range: no subtype information GO to Pinpoint Test DL
PCM P1289:00 Cylinder Head Temperature Sensor Circuit High Signal: no subtype information GO to Pinpoint Test DL
PCM P128A:00 Cylinder Head Temperature Sensor Circuit Intermittent/Erratic Signal: no subtype information GO to Pinpoint Test DL
PCM P1290:00 Cylinder Head Temperature Sensor Circuit Low Signal: no subtype information GO to Pinpoint Test DL

Global Customer Symptom Codes (GCSC) Table

The diagnosis in this manual assumes a certain level of skill and knowledge of Ford-approved diagnostic procedures.
REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).


Symptom Action
Start/Run/Move > Starting > Hard Start/Extended Crank > Always GO to Pinpoint Test DL
Drivability > Rough Running > All Operating Modes > Always GO to Pinpoint Test DL

Pinpoint Tests


DL PINPOINT TEST: CYLINDER HEAD TEMPERATURE (CHT) SENSOR
Introduction

Normal Operation and Fault Symptoms

On applications that do not use an ECT sensor, the CHT sensor is used to determine engine coolant temperature. To cover the full temperature range of both the CHT and ECT sensors, the PCM has a dual-pull-up resistor circuit on the CHT input. The graph shows the switching from the COLD END line to the HOT END line as temperature rises, and back again as temperature falls. Note the voltage overlap zone for temperature. Within this zone, either COLD END or HOT END is possible at the same temperature. For example, at 90°C (194°F) the voltage may be either 0.60 volts or 3.71 volts. Refer to the table for expected values.

Voltage values are calculated for VREF = 5 volts. These values may vary by up to 15% due to sensor and VREF variation.

Refer to DTC Fault Trigger Conditions.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
PCM P0116:00 Engine Coolant Temperature Sensor 1 Circuit Range/Performance: no subtype information Sets when the PCM determines that the engine coolant temperature or cylinder head temperature is above a calibrated value and may prevent one or more OBD monitors from running. The PCM runs this logic after engine shutdown and a calibrated soak period (typically 6 hours). This soak period allows the intake air temperature and the engine coolant temperature or cylinder head temperature to stabilize and not differ by more than a calibrated value. This DTC sets when all of the following conditions are met:
  • Engine coolant temperature at engine start exceeds intake air temperature at engine start by more than a calibrated value, typically 17 °C.
  • Engine coolant temperature exceeds a calibrated value, typically 107 °C.
  • Fuel system, oxygen sensor heater, and misfire monitors have not completed.
  • The calibrated time for setting this DTC has elapsed.
  • Make sure that the intake air temperature, engine coolant temperature, or cylinder head temperature are similar on a cold engine. Also make sure that the ECT or CHT sensor and the actual engine operating temperature agree.
PCM P0119:00 Engine Coolant Temperature Sensor 1 Circuit Intermittent/Erratic: no subtype information Sets when the PCM detects that the ECT circuit is intermittently open or shorted with the engine running.
PCM P017C:00 Cylinder Head Temperature Sensor 'A' Circuit Low: no subtype information Sets when the PCM detects a CHT circuit short to ground. DTC P0117 may also be stored when this DTC sets. Any of these diagnostic trouble codes (DTCs) illuminates the MIL.
PCM P017D:00 Cylinder Head Temperature Sensor 'A' Circuit High: no subtype information Sets when the PCM detects a CHT circuit problem. DTC P0118 may also be stored when this DTC sets. Any of these diagnostic trouble codes (DTCs) illuminates the MIL.
PCM P017E:00 Cylinder Head Temperature Sensor 'A' Circuit Intermittent/Erratic: no subtype information Sets when the PCM detects that the CHT circuit is intermittently open or shorted with the engine running.
PCM P101F:00 Cylinder Head Temperature Sensor 1 Out of Self-Test Range: no subtype information This DTC sets when the CHT sensor is out of the self-test range. The engine does not reach normal operating temperature.
PCM P1021:00 Cylinder Head Temperature Sensor 2 Circuit Range/Performance: no subtype information Sets when the PCM detects that the cylinder head temperature is above a calibrated value and may prevent one or more OBD monitors from completing. The PCM runs this logic after engine shutdown and a calibrated soak period (typically 6 hours). This soak period allows the intake air temperature and the cylinder head temperature to stabilize and not differ by more than a calibrated value. This DTC sets when all of the following conditions are met:
  • Cylinder head temperature at engine start exceeds intake air temperature at engine start by more than a calibrated value, typically 17 °C.
  • Cylinder head temperature exceeds a calibrated value, typically 107 °C.
  • Fuel system, oxygen sensor heater, and misfire monitors have not completed.
  • The calibrated time for setting this DTC has elapsed.
  • Make sure that the intake air temperature and the cylinder head temperature are similar when the engine is cold. Make sure that the intake air temperature and the cylinder head temperature are the same when the engine is cold.
  • Also make sure that the CHT sensor and the actual engine temperature are the same. Also make sure that the CHT sensor and the actual engine temperature are the same.
PCM P1022:00 Cylinder Head Temperature Sensor 2 Circuit Low: no subtype information Sets when the PCM detects a fault in the CHT circuit.
PCM P1023:00 Cylinder Head Temperature Sensor 2 Circuit High: no subtype information Sets when the PCM detects a fault in the cylinder head temperature 2 (CHT2) circuit.
PCM P1024:00 Cylinder Head Temperature Sensor 2 Circuit Intermittent/Erratic: no subtype information Sets when the PCM detects an intermittent fault in the cylinder head temperature 2 (CHT2) circuit with the engine running.
PCM P1025:00 Cylinder Head Temperature Sensor 2 Out of Self-Test Range: no subtype information Sets when the PCM detects that the CHT sensor is outside the self-test range. The engine does not reach normal operating temperature. Bring the engine to operating temperature and repeat the self-test. If the engine is overheating, check the cooling system. Refer to Section 303-03, Engine Cooling, for diagnosis of the engine overheating symptom.
PCM P1026:00 Engine Coolant Temperature Sensor 1 / Cylinder Head Temperature Sensor 2 Correlation: no subtype information Sets when the PCM detects that the ECT and cylinder head temperature 2 (CHT2) sensor readings differ by more than the calibrated value. Make sure that the ECT and CHT 2 sensor readings are within 17°C (30°F) of each other after 6 hours at ambient temperature.
PCM P1285:00 Cylinder Head Overheating Condition: no subtype information Sets when the PCM detects an engine overheating condition detected by the CHT sensor.
PCM P1288:00 Cylinder Head Temperature Sensor Out of Self-Test Range: no subtype information Sets when the PCM detects that the CHT sensor is outside the self-test range. The engine does not reach normal operating temperature. Bring the engine to operating temperature. If cold, repeat the self-test. If the engine is overheating, check the cooling system. Refer to Section 303-03, Engine Cooling, Engine Overheating for cooling system diagnosis.
PCM P1289:00 Cylinder Head Temperature Sensor Circuit High Signal: no subtype information Sets when the PCM detects an open circuit in the CHT circuit. DTC P0118 may also be set when this DTC is set.
PCM P128A:00 Cylinder Head Temperature Sensor Circuit Intermittent/Erratic Signal: no subtype information Sets when the PCM detects that the CHT circuit is intermittently open or shorted with the engine running.
PCM P1290:00 Cylinder Head Temperature Sensor Circuit Low Signal: no subtype information Sets when the PCM detects a CHT circuit short to ground. DTC P0117 may also be set when this DTC is set.

Possible Sources

  • ECT Sensor Circuit Concern
  • CHT Sensor Circuit Concern
  • Base Engine Concerns
  • Engine Cooling System Concerns
  • ECT Sensor
  • CHT Sensor (6G004)
  • PCM (12A650)

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