Aston Martin diagnostic trouble code
P1116: Engine Coolant Temperature Sensor Out Of Self Test Range
Use this reference to understand the recorded condition, confirm the available V8 Vantage or DB9 manual coverage, and follow the documented diagnostic checks before replacing parts.
- Code family
- Powertrain
- Vehicle system
- Cooling and temperature
- Manual coverage
- V8 Vantage, DB9
- Warning-lamp status
- V8 Vantage: Not stated; DB9: MIL
What Aston Martin code P1116 means
Engine Coolant Temperature Sensor Out Of Self Test Range
DB9 preliminary diagnostic manual · section 2-212
Manufacturer fault-analysis procedure
Manual fault definition
P1116 - The ECT sensor signal was out of self test
range (0.3 - 3.7 volts) during KOEO or KOER tests.
range (0.3 - 3.7 volts) during KOEO or KOER tests.
Cautions and notes
CAUTION: The single Engine Coolant Temperature Sensor inputs analogue data to the primary
PCM. The primary sends raw ECT counts to the
secondary PCM over the CAN bus. If P1116 is
logged in both PCMs, diagnose the sensor and
circuit. If P1116 is logged in the secondary PCM
only, the fault is in the secondary PCM or CAN
bus.
PCM. The primary sends raw ECT counts to the
secondary PCM over the CAN bus. If P1116 is
logged in both PCMs, diagnose the sensor and
circuit. If P1116 is logged in the secondary PCM
only, the fault is in the secondary PCM or CAN
bus.
Test sequence and decision path
1. Connect the WDS or scan tool and check for
P1116 code in both PCMs. If P1116 is present
only in the secondary PCM, go to step 6.
If only P1116 is present, Check that the engine is
fully warmed up (above 82°C). If below 82°C,
warm up the engine and rerun the KOER test. If
P1116 is not logged again, the fault was caused
by low coolant temperature and is now cleared.
If P1116 is logged again, go to step 2.
2. Connect the break-out box to the primary PCM.
Run the engine and read the voltage of the ECT
signal. The voltage should be below 0.7 volts with
the engine fully warmed up i.e. above 82°C (see
ECT sensor table).
3. For intermittent low voltage readings, suspect a
short circuit of the ECT sensor signal (nominal
5.0V supply from PCM pin C0636-33) to signal
return (PCM pin C0636-41).
Key off. Shake, wiggle and tap the sensor and circuits during the following test to simulate road
shock.
Check for short circuit between the lines from
PCM pin C0636-33 to the ECT sensor and from
the ECT sensor to PCM pin C0636-41. Also check
for short circuit to ground on the line from PCM
pin C0636-33 to the ECT sensor.
If any wiring problem is found, repair the wiring
as necessary.
4. For intermittent high voltage readings, (above
3.50 volts) suspect an open circuit in the sensor
wiring or internally within the sensor.
Key off, disconnect the ECT sensor, key on. Measure the voltage across the ECT sensor connector.
Approximately 5.0 volts should be present. If not,
there is an open circuit in the line from PCM pin
C0636-33 or in the signal return line to PCM pin
C0636-41.
If approximately 5.0 volts is present, check the
resistance of the ECT sensor. Consult the table of
ECT sensor values, the resistance should be
within 5% of the values in the table. If resistance
is very high or infinite, change the ECT sensor.
5. Clear the P1116 code, run the KOER test to
ensure that the problem is solved.
6. Using the datalogger, check for CAN bus fault
codes in both PCMs. Also note the ECT value in
both PCMs.
If the secondary ECT value is suspect and there
are CAN faults, rectify the CAN faults first. Reset
the PCMs and then return to this procedure if
P1116 recurs.
If the secondary ECT value is suspect and there
are no other CAN related symptoms, replace the
PCMS and run a KOER test to ensure that the
problem is resolved.
Table of ECT Sensor Values
Temperature Voltage Resistance
°F °C Volts K Ohms
248 120 0.27 1.18
230 110 0.35 1.55
212 100 0.46 2.07
194 90 0.60 2.80
176 80 0.78 3.84
158 70 1.02 5.37
140 60 1.33 7.70
122 50 1.70 10.97
104 40 2.13 16.15
86 30 2.60 24.27
68 20 3.07 37.30
50 10 3.51 58.75
Open the corresponding manual page for wiring diagrams and figures
P1116 code in both PCMs. If P1116 is present
only in the secondary PCM, go to step 6.
If only P1116 is present, Check that the engine is
fully warmed up (above 82°C). If below 82°C,
warm up the engine and rerun the KOER test. If
P1116 is not logged again, the fault was caused
by low coolant temperature and is now cleared.
If P1116 is logged again, go to step 2.
2. Connect the break-out box to the primary PCM.
Run the engine and read the voltage of the ECT
signal. The voltage should be below 0.7 volts with
the engine fully warmed up i.e. above 82°C (see
ECT sensor table).
3. For intermittent low voltage readings, suspect a
short circuit of the ECT sensor signal (nominal
5.0V supply from PCM pin C0636-33) to signal
return (PCM pin C0636-41).
Key off. Shake, wiggle and tap the sensor and circuits during the following test to simulate road
shock.
Check for short circuit between the lines from
PCM pin C0636-33 to the ECT sensor and from
the ECT sensor to PCM pin C0636-41. Also check
for short circuit to ground on the line from PCM
pin C0636-33 to the ECT sensor.
If any wiring problem is found, repair the wiring
as necessary.
4. For intermittent high voltage readings, (above
3.50 volts) suspect an open circuit in the sensor
wiring or internally within the sensor.
Key off, disconnect the ECT sensor, key on. Measure the voltage across the ECT sensor connector.
Approximately 5.0 volts should be present. If not,
there is an open circuit in the line from PCM pin
C0636-33 or in the signal return line to PCM pin
C0636-41.
If approximately 5.0 volts is present, check the
resistance of the ECT sensor. Consult the table of
ECT sensor values, the resistance should be
within 5% of the values in the table. If resistance
is very high or infinite, change the ECT sensor.
5. Clear the P1116 code, run the KOER test to
ensure that the problem is solved.
6. Using the datalogger, check for CAN bus fault
codes in both PCMs. Also note the ECT value in
both PCMs.
If the secondary ECT value is suspect and there
are CAN faults, rectify the CAN faults first. Reset
the PCMs and then return to this procedure if
P1116 recurs.
If the secondary ECT value is suspect and there
are no other CAN related symptoms, replace the
PCMS and run a KOER test to ensure that the
problem is resolved.
Table of ECT Sensor Values
Temperature Voltage Resistance
°F °C Volts K Ohms
248 120 0.27 1.18
230 110 0.35 1.55
212 100 0.46 2.07
194 90 0.60 2.80
176 80 0.78 3.84
158 70 1.02 5.37
140 60 1.33 7.70
122 50 1.70 10.97
104 40 2.13 16.15
86 30 2.60 24.27
68 20 3.07 37.30
50 10 3.51 58.75