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Isuzu Axiom Maintenance and Repair

381 messages,  Last post on Sep 16, 2012 at 5:50 PM

You are in the Isuzu Axiom Forum.

What is this discussion about? Isuzu Axiom, SUV

    
 
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Messages Page 38 of 39

#362 of 381 Re: How I Replaced My 02 Axiom Active Shocks [walk_the_walk2] by massmusclecar

Jun 05, 2012 (10:21 am)

Replying to: walk_the_walk2 (Jun 05, 2012 6:23 am)
The replacement aftermarket parts for the Rodeo and Axiom are the same. They are readlily available from rock auto, advance or wherever.
economy...MONROE Part # 32336 Monro-Matic Plus Shock Absorber
  w/o Active Ride Control; Front/ 32337 rear. 16 bucks
 
or OEM ride quality MONROE Part # 37159 OESpectrum Light Truck Shock Absorber
  w/o Active Ride Control; Front/ 37160 rear. $32 bucks
 
I replaced my 2000 rodeo shocks with new monroes. they were the reg setup. I would assume the mounting locations should be the same. but not sure about a diffence in the mounting hole. Just the shock is different, if it is the Intelligent Suspension Control ISC /active ride system or the standard.
i got my shcoks at sears when they had a sale and they put them on the rodeo. My Axiom ISC shocks still seem ok with 82k. but I guess if you picked one up at the auto store and comparted the mounting to it then you would know. or go the the monroe web site and look for illustrations for the mounting locations.
Let us know. i am wondering why you can not just unplug the harness from the top of the shock, and tie it off somewhere, and unplug a fuse or light bulb from the ISC dash light indicator. I do like the firm ride of the ISC when going around a highway off ramp.
regards.
Kent

#364 of 381 Decababy- Your DTC Codes Question Answered! by walk_the_walk2

Jun 16, 2012 (5:27 pm)

Wow. That's a lot of codes! Most are inter-related, though. Thank goodness I own a copy of the 2002 Isuzu Axiom US Version Service Manual. You will also need to get one online someplace if you want to wade through this problem yourself. It's a mess, with a lot of possible scenarios, since there are multiple codes. The good news is that each one is documented in detail in the Service Manual.
 
One of the codes you provided point to a problem with the Mass Air Flow Sensor. In fact, that code (p0101) indicates that the MAF has possibly failed. Code p0401 indicates that either the EGR valve is dirty or failed or the MAP sensor (Manifold Absolute Pressure sensor) has failed.
 
Code p1125 means "ETC (Electric Throttle Control) Limit Performance Mode", which points to a problem with any of the 3 accelerator position sensors (APS1, APS2 or APS3).
 
Code p1295 is similar and indicates a problem with "ETC Power Management Mode" which means either there is a problem with the Throttle Valve or the two Throttle Position Sensors (TPS1, TPS2).
 
DTC code p1515 is similar to 1295 and means "P1515 Command - Actual TPS Correlation Error" and is related to the same circuit above, with the TV and the TPS's.
 
Now, before you go jump off a bridge, or drive your car off a cliff, be aware that what is common to ALL of these codes is that they are all circuits that feed into the PCM module. The Powertrain Control Module.
 
So, it could be as simple as any of these problems, with regard to the PCM:
 
*Poor connections.  Misrouted harness. Rubbed through wire insulation.
 Broken wire inside the insulation.Check for the following conditions:
 Poor connection at PCM-Inspect harness connectors
for backed out terminals, proper mating, locks,
improperly formed or damaged terminals, and poor terminal to wire connection.
 Damaged harness-Inspect the wiring harness for damage."
 
So, look to see if a mouse or squirrel has gotten into the wiring harness and damaged any of the wiring to the sensors. The RPL light may also be caused by a wiring harness or connection issue. The manuals states this:
 
"The powertrain control module (PCM) orders the RPL “ON” signal for Multiplex Control Unit. When Multiplex Control Unit is received RPL “ON” signal that turn RPL “ON” by grounding the RPLdriver circuit. The RPL should not remain “ON” with the engine running and no DTC(s) set. A steady RPL with the engine running and no DTC(s) suggests a short to ground in the RPL driver circuit.
 
Diagnostic Aids
An intermittent RPL may be caused by a poor connection, rubbed through wire insulation, or a wire broken inside the insulation. Check for the following items:
 Poor connection or damaged harness..."
 
The PCM has a hand in ALL of the functions related to the codes you provided, so it is suspect. Let's hope it's not the PCM itself, as replacing that is expensive and requires reprogramming by an Isuzu tech, but assuming BEST CASE, there is the possibility that your PCM wiring harness has been dislodged somehow or got wet? Since the PCM is located "located in the passenger compartment below the center console"... did you spill a beer recently?? Did someone try to make out in the passenger side and bump into one of the PCM connectors with their big foot?
 
Here's the info on the PCM and what it does and where it's located:
 
************
"Powertrain Control Module (PCM)
The powertrain control module (PCM) is located in the
passenger compartment below the center console. The
PCM controls the following:
 
 Fuel metering system.
 Transmission shifting (automatic transmission only).
 Ignition timing.
 On-board diagnostics for powertrain functions.
 
The PCM constantly observes the information from
various sensors. The PCM controls the systems that
affect vehicle performance. The PCM performs the
diagnostic function of the system. It can recognize
operational problems, alert the driver through the MIL
(Check Engine lamp), and store diagnostic trouble codes
(DTCs). DTCs identify the problem areas to aid the
technician in making repairs.
 
PCM Function
The PCM supplies either 5 or 12 volts to power various
sensors or switches. The power is supplied through
resistances in the PCM which are so high in value that a
test light will not light when connected to the circuit. In
some cases, even an ordinary shop voltmeter will not give
an accurate reading because its resistance is too low.
Therefore, a digital voltmeter with at least 10 megohms
input impedance is required to ensure accurate voltage
readings. Tool J 39200 meets this requirement. The PCM
controls output circuits such as the injectors, fan relays,
etc., by controlling the ground or the power feed circuit
through transistors or through either of the following two
devices:
 Output Driver Module (ODM)
 Quad Driver Module (QDM)
PCM Components
The PCM is designed to maintain exhaust emission levels
to government mandated standards while providing
excellent driveability and fuel efficiency. The PCM
monitors numerous engine and vehicle functions via
electronic sensors such as the throttle position (TP)sensor,
heated oxygen sensor (HO2S), and vehicle
speed sensor (VSS). The PCM also controls certain
engine operations through the following:
 
 Fuel injector control
 Ignition control module
 ION sensing module
 Automatic transmission shift functions
 Cruise control
 Evaporative emission (EVAP) purge
 A/C clutch control
PCM Voltage Description
The PCM supplies a buffered voltage to various switches
and sensors. It can do this because resistance in the
PCM is so high in value that a test light may not illuminate
when connected to the circuit. An ordinary shop
voltmeter may not give an accurate reading because the
voltmeter input impedance is too low. Use a 10-megohm
input impedance digital voltmeter (such as J 39200) to
assure accurate voltage readings.
The input/output devices in the PCM include
analog-to-digital converters, signal buffers, counters,
and special drivers. The PCM controls most components
with electronic switches which complete a ground circuit
when turned “ON.” These switches are arranged in
groups of 4 and 7, called either a surface-mounted quad
driver module (QDM), which can independently control up
to 4 output terminals, or QDMs which can independently
control up to 7 outputs. Not all outputs are always used.
 
PCM Service Precautions
The PCM is designed to withstand normal current draws
associated with vehicle operation. Avoid overloading any
circuit. When testing for opens and shorts, do not ground
or apply voltage to any of the PCM’s circuits unless
instructed to do so. These circuits should only be tested
using digital voltmeter J 39200. The PCM should remain
connected to the PCM or to a recommended breakout
box."
 
**********
 
And there is an illustrations, too, of the PCM. It has two gigantic side-by-side...

#366 of 381 Decababy- Your DTC Codes Question Answered! PART 2 by walk_the_walk2

Jun 16, 2012 (5:31 pm)

connectors feeding into it from one side. It is a metallic box with aluminum looking heat sinks on it. Should be easy to find.
 
Anyway, good luck with this problem. I hope it is not the PCM itself and you can find something obvious, but I myself would not hesitate to take this to someone who is VERY SKILLED in dealing with PCMS if there isn't an obvious problem found by visual inspection.
 
And, there is the possibility that any one sensor has gone bad and is pulling down the power supply section of the PCM and causing ALL of the other readings. You see this sometimes, too, but fixing that kind of problem can be a hit-and-miss shotgun approach, where you replace one sensor after another, which is difficult and expensive for the DIY home repairer.
 
Hope this is helpful.

#367 of 381 Re: Decababy- Your DTC Codes Question Answered! [walk_the_walk2] by decababy

Jun 18, 2012 (9:40 am)

Replying to: walk_the_walk2 (Jun 16, 2012 5:27 pm)
thanks alot for the information given. You and this message board are life savers. and i will give you the updated information once my problem is fixed. Thanks again.

#368 of 381 2004 Axiom Shuts off by lbrownstein

Jun 26, 2012 (9:27 am)

Hello, my 2004 Axiom shuts off when I deccelerate too fast or occassionaly when turning. Also, the clock and compass are no longer working. When the car shuts off it completely dies. All electrical and engine activities stop. When it happens, I wait for a moment and then restart the car. So far, no problems after starting again and it drives fine. There are no indicator lights on. Does anyone know what could be the problem?
 
Thank you,
 
Lori

#369 of 381 Re: 2004 Axiom Shuts off [lbrownstein] by kyfdx HOST

Jun 26, 2012 (10:34 am)

Replying to: lbrownstein (Jun 26, 2012 9:27 am)
Sounds like the battery may be loose... and, when it shifts, it loses ground and shorts out?

#371 of 381 2004 Axiom dies while driving by billr9

Jul 13, 2012 (12:21 pm)

Anyone familiar with this? We bought this car for my daughter and it did this a few times while parked (Once at the dealership! Lucky for us because they are backing there commitment to fix or take the car back) but this time it happened while she was driving. Had just got off the interstate (1 1/2 hour drive) and down the road about 3 miles and it died while going around a slight corner! The Dealership we bought it from could not find the problem, sent it to another and supposedly going to a third mechanic who specializes in Isuzu's.

Messages Page 38 of 39

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