Someone tell me what these codes mean please

[nivit0]

Miami sucks because the stores around here aren't allowed to come and pull the codes when your check engine light comes on. It was almost impossible to even find a repair shop with the scan tool, several of them told me disgruntled employees stole them when they quit. My friend brought over an Autotap last night, and we pulled four codes off the car. We cleared them, and several popped right back up again. They're all voltage problems. I don't know the full history of this car, but I can verify anything you may ask. Anyways, the codes are:

h p0118 ect sensor circuit - high voltage
h p1115 ect sensor circuit intermittent high voltage
h p1406 egr valve pintle position circuit high voltage
h p1641 mil control circuit high voltage

I have a Hayne's manual, but I couldn't find reference to an ect sensor, so I'd appreciate if anyone could tell me what that is.

The car has been lowered, has a flowmaster muffler, and a K&N filter. There may be other mods that I don't know about. I made the mistake of taking three other people in the car last week, and did scrape bottom a little going over an oversized speed bump at a crawl speed. I don't know if any of the sensors or wires on the bottom could have been damaged, but I can check anything suggested.

[PewterBird]

Go to this site, It is the GM Service Manual.
You can type in a code and it will give you a description and a "how to" in order to fix it.

http://www.thenebula.com:9001/servlets/Home

Here is an example of what it will tell you

DTC P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage




Circuit Description
The Engine Coolant Temperature (ECT) sensor is a thermistor mounted in the engine coolant stream. The PCM applies a voltage (about 5.0 volts) through a pull up resistor to the ECT signal circuit. When the engine coolant is cold, the sensor (thermistor) resistance is high, therefore the PCM will measure a high signal voltage. As the engine coolant warms, the sensor resistance becomes less, and the ECT signal voltage measured at the PCM drops. With a fully warmed up engine, the ECT signal voltage should measure about 1.5 to 2.0 volts. DTC P0118 will set when the PCM detects an excessively high signal voltage on the engine coolant temperature sensor signal circuit.

Conditions for Setting the DTC
Engine run time longer than 3 seconds
The ECT sensor signal indicates an engine coolant temperature less than -38°C (-36°F).
Above condition present for up to 1 minute
Action Taken When the DTC Sets
The PCM will illuminate the MIL during the second consecutive trip in which the diagnostic test has been run and failed.
The PCM will store conditions which were present when the DTC set as Freeze Frame and Fail Records data.
Conditions for Clearing the MIL/DTC
The PCM will turn the MIL OFF during the third consecutive trip in which the diagnostic has been run and passed.
The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The DTC can be cleared by using the scan tool Clear Information function or by disconnecting the PCM battery feed.
Diagnostic Aids
Check for the following conditions:

Poor connection at the PCM - Inspect harness connectors for the following conditions:
Backed out terminals.
Improper mating.
Broken locks.
Improperly formed or damaged terminals.
Poor terminal to wire connection.
Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the ECT display on the scan tool while moving connectors and wiring harnesses related to the ECT sensor. A change in the ECT display will indicate the location of the malfunction.
Skewed or mis-scaled ECT Sensor. Refer to Temperature vs Resistance table.
If DTC P0118 cannot be duplicated, the information included in the Fail Records data can be useful in determining vehicle mileage since the DTC was last set. If it is determined that the DTC occurs intermittently, performing the DTC P1115 Diagnostic Chart may isolate the cause of the malfunction.

Test Description
The number(s) below refer to the Step number(s) on the Diagnostic Chart:

Verifies that the fault is present.

If DTC P0118 can be repeated only by duplicating the Fail Records conditions, refer to Temperature vs Resistance . The table may be used to test the ECT sensor at various temperatures to evaluate the possibility of a shifted sensor that may be shorted above or below a certain temperature. If this is the case, replace the ECT sensor. If the ECT sensor appears to be OK, the fault is intermittent; refer to Diagnostic Aids.

This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.

Step
Action
Value(s)
Yes
No

1
Was the Powertrain On-Board Diagnostic (OBD) System Check performed?
--
Go to Step 2
Go to the Powertrain On Board Diagnostic (OBD) System Check

2
Turn ON the ignition switch, observe the Eng. Cool. Temp. display on the scan tool Eng 1 data list.

Is Eng. Cool. Temp. display less than the specified value?
-38°C (-36°F)
Go to Step 4
Go to Step 3

3
Turn ON the ignition switch.
Review and record scan tool Fail Records data.
Operate the vehicle within Fail Records conditions as noted.
Using a scan tool, monitor Specific DTC info for DTC P0118.
Does the scan tool indicate DTC P0118 failed?
--
Go to Step 4
Refer to Diagnostic Aids

4
Turn OFF the ignition switch.
Disconnect the PCM and the ECT harness connectors
Turn ON the ignition switch.
Check the ECT sensor signal circuit for a short to voltage. If a problem is found, repair as necessary. Refer to Wiring Repairs in Electrical Diagnosis.
Was a problem found?
--
Go to Step 13
Go to Step 5

5
Turn OFF the ignition switch.
Reconnect the PCM.
Jumper the ECT signal circuit and the sensor ground circuit together at the ECT sensor harness connector
Observe ECT displayed on the scan tool.
Is ECT at the specified value?
140°C (284°F)
Go to Step 7
Go to Step 6

6
Jumper the ECT signal circuit at the ECT sensor harness connector to chassis ground.
Observe the Eng. Cool. Temp. display on the scan tool.
Is Eng. Cool. Temp. at the specified value?
140°C (284°F)
Go to Step 8
Go to Step 9

7
Check for poor connections at the ECT sensor and replace terminals if necessary. Refer to Wiring Repairs in Electrical Diagnosis.

Did any terminals require replacement?
--
Go to Step 13
Go to Step 11

8
Turn OFF the ignition switch.
Disconnect the PCM.
Check the ECT sensor ground circuit for an open.
If the ECT sensor ground circuit is open, repair it as necessary. Refer to Wiring Repairs in Electrical Diagnosis.
Was the ECT sensor ground circuit open?
--
Go to Step 13
Go to Step 10

9
Turn OFF the ignition switch.
Disconnect the PCM.
Check the ECT signal circuit for an open.
If the ECT sensor signal circuit is open, repair it as necessary. Refer to Wiring Repairs in Electrical Diagnosis.
Was the ECT signal circuit open?
--
Go to Step 13
Go to Step 10

10
Check for a poor sensor ground or ECT signal circuit terminal connection at the PCM and replace terminal(s) if necessary. Refer to Wiring Repairs in Electrical Diagnosis.

Did any of the terminals need to be replaced?
--
Go to Step 13
Go to Step 13

11
Replace the ECT sensor. Refer to Engine Coolant Temperature (ECT) Sensor Replacement

Is the action complete?
--
Go to Step 13
--

12
Replace the PCM.


Important
The replacement PCM must be programmed. Refer to PCM Replacement/Programming


Is the action complete?
--
Go to Step 13
--

13
Review and record scan tool Fail Records data.
Clear DTCs
Operate the vehicle within Fail Records conditions as noted.
Using a scan tool, monitor Specific DTC info for DTC P0118.
Does the scan tool indicate DTC P0118 failed?
--
Go to Step 2
System OK

[white00camaro]

that site didn't work for me. you sure it's correct?

[98Camaro3.8]

Originally posted by white00camaro:
that site didn't work for me. you sure it's correct?

That's because it's a year old. [img]graemlins/slap.gif[/img]