Acura RL (1996-2004 year). Manual — part 377
The ECT Sensor is a temperature dependent resistor (thermistor). The resistance of the thermistor decreases as the engine
coolant temperature increases as shown below.
THERMISTOR
ENGINE COOLANT TEMPERATURE
NOTE: If DTC P0117 and/or P0118 are stored at the same time as DTC P0116, troubleshoot those DTCs first, then trou-
bleshoot DTC P0116.
Possible Cause
• ECT sensor deterioration
• Malfunction in the thermostat and the cooling system
Troubleshooting Flowchart
ls176-200°F (80 - 93°C)
indicated?
Intermittent failure, system is OK
at this time. Check the thermo-
stat and the cooling system.
NO
Check the thermostat and the
cooling system. If they are OK,
replace the ECT sensor.
YES
RESISTANCE
The scan tool indicates Diagnostic Trouble Code (DTC) P0116: A range/performance problem in the Engine
Coolant Temperature (ECT) sensor circuit.
Engine Coolant Temperature (ECT) Sensor
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PGM-FI System
Engine Coolant Temperature (ECT) Sensor (cont'd)
The scan tool indicates Diagnostic Trouble Code (DTC) P0117: A low voltage (high temperature) problem in the
Engine Coolant Temperature (ECT) sensor circuit.
— The MIL has been reported on.
— DTC P0117 is stored.
Problem verification:
1. Turn the ignition switch ON (II).
2. Check the ECT with the scan
tool.
ls302°F (150°C) or higher (or
H-Limit in Honda mode of
PGM Tester) or 0 V indicated?
YES
Check for a short in the ECT sen-
sor:
1. Disconnect the ECT sensor
connector.
2. Check the ECT with the scan
tool.
ls302°F (150°C) or higher (or
H-Limit in Honda mode of
PGM Tester) or 0 V indicated?
YES
Check for a short in the wire
(ECT line):
1. Turn the ignition switch OFF.
2. Disconnect the PCM connec-
tor D (22P).
3. Check for continuity between
No. 2 terminal on the ECT
sensor connector and body
ground.
NO
Intermittent failure, system is OK
at this time. Check for poor con-
nections or loose wires at C251,
C254 (located at left shock tower),
C128 (ECT sensor), C531 (climate
control unit) and PCM.
Replace the ECT sensor.
ECT SENSOR CONNECTOR (C128)
Is there continuity?
YES
NO
Substitute a known-good PCM
and recheck (see page
for
immobilizer information). If nor-
mal ECT is indicated, replace the
original PCM.
Wire side of female terminals
Is there continuity?
Repair short in the wire between
PCM (D7) and ECT sensor.
Replace the climate control unit.
NO
YES
Check the climate control unit
circuits:
1. Turn the ignition switch OFF.
2. Disconnect 20P connector
from the climate control unit.
3. Check for continuity between
No. 2 terminal on the ECT
sensor connector and body
ground.
NO
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The scan tool indicates Diagnostic Trouble Code (DTC) P0118: A high voltage (low temperature) problem in the
Engine Coolant Temperature (ECT) sensor circuit.
— The MIL has been reported on.
— DTC P0118 is stored.
Problem verification:
1. Turn the ignition switch ON (II).
2. Check the ECT with the scan
tool.
Is -4°F (-20°C) or less (or L-
Limit in Honda mode of PGM
Tester) or 5 V indicated?
YES
Check for an open in the ECT sen-
sor:
1. Disconnect the ECT sensor
connector.
2. Install a jumper wire between
the two terminals on the har-
ness side of the ECT sensor
connector.
3. Check the ECT with the scan
tool.
Is -4°F (-20°C) or less (or L-
Limit in Honda mode of PGM
Tester) or 5 V indicated?
YES
Check for an open in the wires
(ECT, SG2 lines):
1. Turn the ignition switch OFF.
2. Install a jumper wire between
D7 and D22 on the PCM con-
nector.
3. Turn the ignition switch ON (II).
4. Check the ECT with the scan
tool.
Is -4°F (-20°C) or less (or L-
Limit in Honda mode of PGM
Tester) or 5 V indicated?
YES
Substitute a known-good PCM
and recheck (see page
for
immobilizer information). If nor-
mal ECT is indicated, replace the
original PCM.
Intermittent failure, system is OK
at this time. Check for poor con-
nections or loose wires at C251,
C254 (located at left shock tower),
C128 (ECT sensor) and PCM.
ECT SENSOR CONNECTOR (C128)
SG2
(GRN/BLU)
JUMPER WIRE
Replace the ECT sensor.
ECT
(RED/WHT)
Wire side of female terminals
Repair open in the wires between
PCM (D7, D22) and ECT sensor.
Wire side of female terminals
SG2
(GRN/BLK)
JUMPER WIRE
PCM CONNECTOR D (22P)
ECT (RED/WHT)
NO
NO
NO
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PGM-FI System
Throttle Position (TP) Sensor
The scan tool indicates Diagnostic Trouble Code (DTC) P0122: A low voltage problem in the Throttle Position
(TP) sensor circuit.
The TP Sensor is a potentiometer. It is connected to the throttle valve shaft. As the throttle position changes, the throttle
position sensor varies the voltage signal to the PCM.
— The MIL has been reported on.
— DTC P0122 is stored.
Problem verification:
1. Start the engine. Hold the
engine at 3,000 rpm with no
load (in Park or neutral) until
the radiator fan comes on,
then turn the ignition switch
OFF.
2. Turn the ignition switch ON (II).
3. Check the throttle position
with the scan tool.
Is there approx. 10% when
the throttle is fully closed
and approx. 90% when the
throttle is fully opened?
NO
Check for an open in the wire
(VCC2 line):
1. Turn the ignition switch OFF.
2. Disconnect the TP sensor con-
nector.
3. Turn the ignition switch ON (II).
4. Measure voltage between
No. 1 terminal and No. 3 termi-
nal on the TP sensor connector.
BRUSH
HOLDER
BRUSH
RESISTOR
YES
Is there about 5 V?
NO
YES
Check for an open or short in TP
sensor:
1. Turn the ignition switch OFF.
2. Measure resistance between
No. 1 terminal and No. 2 ter-
minal on the sensor side of
TP sensor connector with the
throttle fully closed.
*: with TCS
*1: with VSA
TERMINAL
INNER
BUSHING
IDLE
FULL
THROTTLE
THROTTLE
OPENING
Intermittent failure, system is OK
at this time. Check for poor con-
nections or loose wires at C113
(TP sensor) C251, C253, C254
(located at left shock tower),
C623 (TCS control unit)* C450
(VSA converter unit)*
1
and PCM.
TP SENSOR CONNECTOR (C113)
Wire side of female terminals
Check for an open in wire (VCC2,
line):
Measure voltage between D21
terminal and D22 terminal on the
PCM connector.
Wire side of female terminals
Is there about 5 V?
Repair open in the wire between
PCM (D21) and TP sensor.
NO
Substitute a known-good PCM
and recheck (see page
for
immobilizer information). If pre-
scribed voltage is now available,
replace the original PCM.
Terminal side of
male terminals
YES
PCM CONNECTOR D (22P)
OUTPUT VOLTAGE (V)
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