1997 GMC Jimmy engine codes?

Question

I am trying to find out what engine codes P0121, P0141 mean on my Jimmy, or a site I can go to look it up.

Answer 1

121 is the TPS (throttle position sensor). It's an inexpensive part, replace it.

141 is an O2 code. Here is how to test;

Circuit Description
The VCM supplies a voltage of approximately 0.45 volt (450 mV) between the HO2S High and the HO2S Low circuits. If a 10 megohm digital voltmeter measures this voltage, the voltage may read as low as 0.32 volt. The Heated Oxygen Sensor (HO2S) varies the voltage within a range of about 1.0 volt (1000 mV) if the exhaust is rich to as low as 0.1 volt (100 mV) if the exhaust is lean.

The VCM has the capability to monitor this process by using the Heated Oxygen Sensor (HO2S Bank 1, Sensor 2). The HO2S (Bank 1, Sensor 2), located in the exhaust stream before the catalytic converter, produces an output signal which indicates the storage capacity of the catalyst; this in turn indicates the catalyst's ability to convert the exhaust emissions effectively. If the catalyst is functioning properly, the HO2S signal will be far less active than the signal produced by the Heated Oxygen Sensor (Bank 1, Sensor 1).

When the HO2S temperature measures below 360°C (600°F), the sensor will not produce any voltage and will behave like an open circuit. This will result in an Open Loop operation.

The HO2S heater provides for a faster sensor warm-up which allows the sensor to become an active in a shorter period of time and remain active during long extended idle. The DTC P0141 determines if the HO2S is functioning properly by checking the response time of the sensor. This DTC is a type B DTC.

Conditions for Setting the DTC



The system voltage is greater than 9.0 volts but less than 17.0 volts.
The MAF is less than 27 grams per second.
The engine run time is greater than 2 seconds.
The ECT sensor is less than 32°C.
The IAT is less than 32°C.
The deference between the ECT and IAT is no more than 5°C.
The elapsed time to obtain the ±0.150 volts from the average HO2S bias voltage (0.299-0.598 volts) is greater than 160 seconds.
Action Taken When the DTC Sets
With a current DTC set, the Malfunction Indicator Lamp (MIL) turns on after 2 test failures.

Conditions for Clearing the MIL/DTC
The VCM turns the MIL off after 3 consecutive driving trips without a fault condition present. A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 40°F from the start-up coolant temperature and the engine coolant temperature exceeds 160°F during that same ignition cycle) or the scan tool clearing feature has been used.

Diagnostic Aids
A rubbed through wire insulation or a wire contacting the exhaust may cause an intermittent. Check for a poor connection or damaged harness. Inspect the 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
NOTE : Never solder the HO2S wires. For proper wire and connector repairs, refer to Wiring Repairs in Engine Electrical.

Test Description
The numbers below refer to the step numbers on the diagnostic table.



This step determines if the DTC P0141 is the result of a hard failure or an intermittent condition. With the ignition switch ON leaving the engine off, the HO2S (Bank 1, Sensor 2) voltage displayed on the scan tool should gradually change to 0.300 volt. This indicates that the heater is working properly. The HO2S voltage can rise as high as 975 mV (0.975 volts) before it toggles back down. The main thing to look for is a change.
Probing the terminal D of the HO2S 2 connector verities if the voltage is available to the HO2S (Bank 1, Sensor 2) heater.
If the voltage exists at the connector, then it becomes a good voltage source to check for a ground at the terminal C.
This step determines it the voltage does not exist at the HO2S (Bank 1, Sensor 2) because of an open ignition feed circuit. If the fuse is open, determine if it was caused by a short in the ignition feed circuit before replacing the fuse.

Answer 2

P0121 Throttle Position Sensor Circuit voltage out of range
P0141 Oxygen Sensor heater circuit fault

You can go here------>

http://www.obd-codes.com/trouble_codes/index.php

…for the same information.
As for repairs, refer to the repair or shop manual for proper diagnostics BEFORE replacing components.
The codes refer to the whole circuit or system, not the component alone. If you have a code for the TPS, also involved is the wiring and connections. Also contributing to the circuit is anything else drawing its power from the same voltage regulator inside the computer.
Perform diagnostics, THEN the repair, then you will repair the problem and not the symptom, and you will only do it once.

Happy Motoring

Answer 3

Back in 98, there was a recall for most Jimmys, my step dad had one and it all depends on the care the vehicle receives. Your GMC may be too far in the hole to ever make a recovery. To be honest, get a new car that is also so much more gas efficient. Sry i couldnt help.

Answer 4

Not sure about a web site .........But if you call your local auto parts store or GMC dealer they can help you I belive Po121 is you camshaft postin sensor

Answer 5

PO121- IS THROTTLE POSITION SENSOR (TPS) RANGE /PERFORMANCE FAULT
PO141 - IS O2 ,SENSOR HEATER CIRCUIT FAULT ( BANK ONE ,SENSOR 2 )
BEST ADVISE IS TO TAKE IT TO A DEALERSHIP OR A GARAGE THAT YOU HAVE BEEN DEALING WITH .BOTH COULD GET QUITE PRICEY .HOPE THIS HELPS .