Need help

Tiny
01MIKEYROSA
  • MEMBER
  • 1997 SATURN SEDAN
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 170,000 MILES
I have a 1997 saturn sl1 4 cyl front wheel drive automatic 132,798 miles I have the following codes on the check engine scan p0118, p0125, p0711, p1404 I need help with this need to know what parts to buy and how to fix. Thanks please help.
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Monday, February 7th, 2011 AT 7:38 PM

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Tiny
SATURNTECH9
  • EXPERT
The P0711, P0118, and P0125 Is most likely a bad coolant temp sensor I would also inspect the connector going to it if it's corroded then you will have to replace the connector too. Also check the wiring going to the sensor for damage all those code's point to the sensor and or wiring and connector pretty common on that car. The P1404 could be a sicking egr valve closed or open you will have to remove it and see if the pintle is sticking open or closed. You would push the pintle down slowly see if it open's freely. Then push it all the way down till it bottom's out and slowly release it see if it get's stuck down. Here are the code description's. Let me know what you find.
The engine coolant temperature (ECT) sensor is a thermistor located in the lower coolant passage of the engine's cylinder head. When coolant temperature is cold the sensor has a high resistance; as temperature increases the resistance of the sensor decrease. The PCM provides a five volt signal to the coolant sensor, which is also connected to PCM ground. The PCM reads the voltage drop on the signal line to determine coolant temperature.

DTC PARAMETERS

DTC P0125 will set if the coolant temperature is below 0 C (32 F) after the engine has been running for more than five minutes when:

* No ECT and IAT DTCs have been set.

This DTC will only pass if engine start was determined to be a cold start.

CAUTION: THE ECT SIGNAL IS CONTINUOUSLY CHECKED WHEN THE ENGINE IS RUNNING.

DIAGNOSTIC AIDS

DTC P0125 indicates lower than normal coolant temperatures and probably does not indicate a faulty ECT subsystem.

Possible causes of low coolant temperature

* Thermostat stuck open
* Cooling fan always on
The engine coolant temperature sensor (ECT) is a thermistor located in the lower coolant passage of the engine's cylinder head. When coolant temperature is cold the sensor has a high resistance, as temperature increases the resistance of the sensor decreases. The PCM provides a five volt signal to the coolant sensor, which is also connected to PCM ground. The PCM reads the voltage drop on the signal line to determine coolant temperature.

DTC PARAMETERS

DTC P0118 and P1115 will set if the ECT reads below -35 C (-31 F) when:

* The engine has been running longer than four minutes.
* DTC P1115 will set if the conditions are met for two seconds. P0118 will set after five seconds.

CAUTION: THE ECT SIGNAL IS CONTINUOUSLY CHECKED WHEN THE ENGINE IS RUNNING.

DIAGNOSTIC AIDS

When attempting to diagnose an intermittent problem, use the Scan tool to review malfunction history diagnostic information. The supplemental data can be used to duplicate a problem.

Check the tightness of the female terminal grip with a spare male terminal.

Start engine and observe ECT reading on Scan tool. Normal operation is for the ECT to rise smoothly to approximately 88 C (190 F), as thermostat opens then stabilizes.

Visually inspect ECT wires for damage. Wiggle wires while observing Scan tool ECT reading and watch for a sudden shift in temperature.

ECT may be compared to IAT temperature, with a Scan tool if engine has cooled overnight at ambient temperature. They should be within four degrees of each other with ignition On - engine Off.

CAUTION: TO AVOID THE DANGER OF BEING BURNED, DO NOT REMOVE THE COOLANT SURGE TANK CAP WHILE THE ENGINE, RADIATOR AND TANK ARE HOT. SCALDING FLUID AND STEAM CAN BE BLOWN OUT UNDER PRESSURE.

To verify coolant sensor integrity, install a thermometer in the coolant surge tank. With engine running and A/C Off, the temperature in the bottle and the Scan tool reading for ECT should be within 15 F of each other.

CAUTION: IF A DTC P0118 AND/OR P1115 IS ACTIVE, THE TEMPERATURE GAGE WILL READ HALF.

NOTE: A short to B+ on circuit 410 will cause damage to the sensor. If found to be shorted, test sensor for proper resistive value.

NOTE: If fused jumper (in test chart step) blows fuse, locate and repair short to B+ in circuit.
The transaxle fluid temperature sensor, engine coolant temperature sensor (ECT) and the intake air temperature sensor (IAT) are thermistor circuits. When the sensors are cold, they have high resistance and high sensor voltage. As the temperature increases, this resistance and voltage decreases. The PCM supplies a five-volt signal to the sensors, which is also connected to ground. The PCM reads the voltage drop on the sensor signal lines to determine the corresponding temperature.

DTC PARAMETERS

DTC P0710 is set when the PCM has detected the following conditions for more than 25.6 minutes:

* No ground/open in the temperature circuit.
* No short in the temperature circuit.
* Temperature value (TV) is less than a calculated temperature based on engine temperature (ET) and intake air temperature (IAT).

TV < [(ET C + IAT C)] / 2 - 53 C

DTC P0711 is set when the PCM/TC has completed two warm-up cycles with the following parameters detected:

* Engine coolant below 30 C (80 F) after exceeding 71 C (160 F).
* IAT and ECT within 60 C (100 F).
* Transaxle fluid temperature reading is greater than 90 C (160 F) of the IAT during start-up.

IMPORTANT: The transaxle fluid temperature ECT and IAT sensors are continuously checked when ignition is On.

NOTICE: Visually inspect the transaxle fluid temperature, ECT and IAT wires for evidence of shorts to battery/ignition voltage. Shorts to battery/ignition voltage will skew the sensor's resistance and cause DTC P0710 and P0711 to set.

DIAGNOSTIC AIDS
With ignition On and engine Off, observe the transaxle fluid temperature vs ECT vs IAT sensor after the vehicle obtained a cold soak.

When attempting to diagnose an intermittent problem use the Scan tool* to review supplemental diagnostic information. The supplemental data can be used to duplicate a problem.

* Select MALF History and DTC status from DTC menu of Scan tool.

IMPORTANT: The PCM uses two internal circuits to identify transaxle temperature. One circuit is used for temperatures of 48 C (118 F) and below. If either circuit has failed, the DTC will set. However, the temperature may look normal in the other range.

* Test low scale with engine at room temperature and high scale with engine at normal operating temperature (above 70 C [158 F]).

IMPORTANT: DTC Code P0711 can not be cleared until the TFT sensor passes at least one warm-up cycle. Refer to P0711 DTC Parameters for specific requirements.

The chart lists the resistances of the transaxle fluid temperature, IAC and ECT sensors compared to temperature.

The linear EGR system consists of a linear EGR valve, the PCM and its associated wiring. The EGR valve solenoid is controlled directly by the PCM when certain conditions have been met. The PCM contains a diode feedback circuit which dissipates energy when the valve is cycled Off. When the PCM commands the EGR valve closed, a closed valve position value is learned. If the PCM commands the valve closed and the actual feedback value does not match the learned value, DTC P1404 will set.

DTC PARAMETERS

DTC P1404 will set when the actual closed value does not match the learned closed value within 20 seconds if:

* RPM is below 5000 and the actual vs learned is greater than 0.2 volts,

or

* RPM is above 5000 and the actual vs learned is greater than 0.4 volts.

IMPORTANT: When the PCM recognizes that the parameters for setting P1404 have been set, the diagnostic software waits until the EGR cycles open 25% or greater three times and then retests. If after the three cycles the actual vs learned is not within the parameters, the DTC will be stored and the MIL (SERVICE ENGINE SOON) will be commanded On.

IMPORTANT: When this DTC sets, some EGR functions will be disabled for the duration of that ignition cycle. When repairs are complete, codes must be cleared to allow proper operation.

DIAGNOSTIC AIDS

When attempting to diagnose an intermittent problem, use the Scan tool to review malfunction history diagnostic information. The supplemental data can be used to duplicate a problem.

The purpose of this diagnostic is to find a sticking pintle in the EGR. Inspect the valve for debris, such as carbon holding the pintle off of the seat. Verily the pintle moves freely and the return spring forces the pintle closed.
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Monday, February 7th, 2011 AT 8:01 PM

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