Chrysler 2005 Crossfire SRT6 Service Manual page 2044

9 - 120 ENGINE - ELECTRICAL DIAGNOSTICS
(P0128) THERMOSTAT RATIONALITY (CONTINUED)
8.
SIGNAL CIRCUIT SHORT TO VOLTAGE
Note: Visually inspect both the component and the PCM connec-
tors. Look for damage, partially broken wires and backed out or
corroded terminals
Turn the ignition off.
Disconnect the ECT Sensor harness connector.
Note: Check connectors — Clean/repair as necessary.
With the ignition on.
Measure the voltage of the ECT Sensor Signal circuit at the ECT Sen-
sor harness connector.
Is the voltage below 5.2 volts?
Yes >> Go To 9
No >> Repair the ECT Signal circuit for a short to voltage.
Perform POWERTRAIN VERIFICATION TEST - VER 2.
9.
MEASURE THE ENGINE COOLANT TEMPERATURE SENSOR VOLTAGE WITH THE DRB III
With the ignition on.
With the DRB III , read the COOLANT TEMP ADC voltage.
Is the voltage above 4.6 volts?
Yes >> Go To 10
No >> Go To 13
10.
ECT SENSOR VOLTAGE BELOW 1.0 VOLT
Turn the ignition off.
Using a jumper wire, jumper across the ECT Sensor harness connec-
tor.
Turn the ignition on.
With the DRB III , read the COOLANT TEMP ADC voltage.
Is the voltage below 1.0 volt?
Yes >> Replace the Engine Coolant Temperature Sensor. (Refer
to 7 - COOLING/ENGINE/ENGINE COOLANT TEMP
SENSOR - REMOVAL).
Perform POWERTRAIN VERIFICATION TEST - VER 2.
No >> Go To 11
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