Reading Codes OBD-I Systems
Fig. 1: Diagnostic trouble codes — 4.5L engine
Fig. 2: Diagnostic trouble codes — 4.9L engine
Fig. 3: Diagnostic trouble codes — 4.6L engine
Listings of the trouble codes for the various engine control systems covered in this manual are located in this section. Remember that a code only points to the faulty circuit NOT necessarily to a faulty component. Loose, damaged or corroded connections may contribute to a fault code on a circuit when the sensor or component is operating properly. Be sure that the components are faulty before replacing them, especially the expensive ones.
The Assembly Line Diagnostic Link (ALDL) connector or Data Link Connector (DLC) may be located under the dash and sometimes covered with a plastic cover labeled DIAGNOSTIC CONNECTOR.
On all 1990–95 models the diagnostic trouble codes can be read by grounding test terminal B. The terminal is most easily grounded by connecting it to terminal A (internal ECM ground). This is the terminal to the right of terminal B on the top row of the ALDL connector.
Once the terminals have been connected, the ignition switch must be moved to the ON position with the engine not running.
The Service Engine Soon or Check Engine light should be flashing. If it isn't, turn the ignition OFF and remove the jumper wire. Turn the ignition ON and confirm that light is now on. If it is not, replace the bulb and try again. If the bulb still will not light, or if it does not flash with the test terminal grounded, the system should be diagnosed by an experienced driveability technician. If the light is OK, proceed as follows.
The code(s) stored in memory may be read through counting the flashes of the dashboard warning lamp. The dash warning lamp should begin to flash Code 12. The code will display as one flash, a pause and two flashes. Code 12 is not a fault code. It is used as a system acknowledgment or handshake code; its presence indicates that the PCM can communicate as requested. Code 12 is used to begin every diagnostic sequence. Some vehicles also use Code 12 after all diagnostic codes have been sent.
After Code 12 has been transmitted 3 times, the fault codes, if any, will each be transmitted 3 times. The codes are stored and transmitted in numeric order from lowest to highest.
NOTE: The order of codes in the memory does not indicate the order of occurrence.
If there are no codes stored, but a driveability or emissions problem is evident, the system should be diagnosed by an experienced driveability technician.
If one or more codes are stored, record them. Refer to the applicable Diagnostic Code chart in this section.
Switch the ignition OFF when finished with code retrieval or scan tool readings.
NOTE: After making repairs, clear the trouble codes and operate the vehicle to see if it will reset, indicating further problems.
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When I run search for p01252 and p15073 I got no hits codes do not exist. The p0401 is a good code and comely found it is for the EGR system (exhaust gas recycle) to do proper test all you need is a vacuum pump and volt meter. A scan tool would make it a lot easyer but most people don't have one. Do a visual check. The most common item is the DPFEGR sensor which should be replaced with the hoses.
The test to pinpoint the problem requier specal test equiment. Double check on the other 2 codes.
The E98 is P/N to D/R In ISC (Idel Speed Control) Range problem. This code will not trigger a service light.
The F47 is Refrigerent System Problem. This code turns on the Service Air Cond light, and switched the Climate Control from Auto to Economy.
keep working it, but don't be too rough it is just plastic. Some are a little harder to remove than others, be sure there are no more fasteners preventing it from coming out
is it having idle stumble?
put a obd2 on it and see what the code is at autozone.
its an o2 sensor id bet.
change o2 sensors and use super unleaded.
spray out throttle body right before the throttle plate.use carb cleaner.anything but super mucks up the inside really bad on newer type engines.and on newer cars like an o6 with no problems well this is it for sure.
make corrections and clear the codes.
E13-Oxygen sensor voltage stays between 0.307 and 0.609 volts for 64 seconds. Engine was at normal operating temperature at a speed over 800 RPM. E44-Right oxygen sensor was lean for more than 50 seconds when engine was warm and at 800 RPM or greater. E52-PCM has lost primary battery power. E58-Pass Key fuel enable was not correct. F47-PCM has received bad data from IPC for 3 seconds while engine speed was 500 RPM or more for 3 seconds. F48-EGR open command was given during off idle operation. EGR opening should cause the mixture to be slightly richer because of the low oxygen content of exhaust gas. Vehicle speed was over 35 MPH and engine was warm. Good luck and hope this helps, keep me posted be glad to answer any questions you may have.
Reading Codes
OBD-I Systems
Fig. 1: Diagnostic trouble codes — 4.5L engine
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