Code 1299 indicates a forced shut down. I found a TSB that references this. Here is what it indicates:
The final complaint is also related to a Reduced Power Light present. The MIL on, and a forced shut-down condition. The vehicle will crank but will not start. This condition may be related to a Throttle Motor condition and/or the loss of either or both five-volt references for the Throttle Position Sensors and the Accelerator Position Sensors.
The 5v reference comes from the PCM. It could be a damaged wire or connection issue. However, the P601 indicates internal PCM failure.
Here is what I've done: I went through the 1125 and 1299 codes. The problem is the forced shut down issue (1299). That is what is shutting it down. Since the possible cause is loss of the 5v reference from the PCM, then the P0601 makes sense that the PCM has an internal fault.
If you look at pic 1 below, it shows where to check next if a P0601 is present. When I go to that number in the DTC table, it indicates what you see in pic 2. I select 601 from that table and here is what I get. See the remaining pics.
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2000 Isuzu Truck Rodeo LS 2WD V6-3.2L
P0601
Vehicle ALL Diagnostic Trouble Codes ( DTC ) Testing and Inspection P Code Charts P0601
P0601
Steps 1 - 2
see pic 3
DTC P0601 PCM Memory
see pic 4
Circuit Description
The powertrain control module (PCM) used in this vehicle utilizes an electrically erasable programmable read-only memory (EEPROM). The EEPROM contains program information and the calibrations required for engine, transmission, and powertrain diagnostics operation.
Unlike the PROM used in past applications, the EEPROM is not replaceable When the PCM is replaced or a calibration update is required, the PCM must be programmed using a Tech 2. Refer to Powertrain Control Module and Sensors in On-Vehicle Service for the EEPROM programming procedure.
Conditions for Setting the DTC
- The PCM detects an internal program fault (check sum error).
Action Taken When the DTC Sets
- The PCM will not illuminate the malfunction indicator lamp (MIL).
- The PCM will store conditions which were present when the DTC was set in the Failure Records data only.
Conditions for Clearing the MIL/DTC
- The PCM will turn the MIL "OFF" on the third consecutive trip cycle during which the diagnostic has been run and the fault condition is no longer present.
- A history DTC P0601 will clear after 40 consecutive warm-up cycles have occurred without a fault.
- DTC P0601 can be cleared by using the Tech 2 "Clear Info" function or by disconnecting the PCM battery feed.
Diagnostic Aids
- DTC P0601 indicates that the contents of the EEPROM have changed since the PCM was programmed. The only possible repair is PCM replacement. Remember to program the replacement PCM with the correct software and calibration for the vehicle.
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That is why I am suspecting the PCM. I hope that makes sense. Could I be wrong? Absolutely. However, this is where it is pointing for me.
Joe
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Friday, May 29th, 2020 AT 9:33 PM
