The reason the light is flashing constantly is because the vehicle is sensing that four wheel drive(4WD) is not working. These 4WD systems use vacuum from the engine to engage/disengage to front axle. The vehicle probably has no vacuum going to the front axle, which would not allow the 4WD shift to complete, which would then leave the light on the dash flashing.
First thing to check is that the vacuum actuator on the firewall is working as it should.
Sounds to me like it's your catalytic converter, do you smell any rotten egg smell or sulfur? There's ways of finding out by putting some sort of device on the end of your tailpipe but I have other ways of doing that that doesn't cost nothing. Lol but it definitely sounds like your catalytic converter does it lose power?
Maybe try changing the coil.
on occasion excess heat can cause the windings in the coil to reveal a tiny break in the wire, while the engine is running the gap will continue to arc across, but fail to connect after shutting down the engine.
once the coil cools the wiring contracts and reconnects.
Is it a factory security alarm or aftermarket? Are you disarming the alarm using the fob? What happens when you try to start the Jimmy after disarming the alarm - do you get only a flashing "Security" or "Theft" light, or do you just hear a loud click noise?
G105 ground 105 - G105
(CKT 450, CKT 451) In the engine harness, on the LR side of the cylinder head
DTC P0102 Mass Air Flow (MAF) Sensor Circuit Low Frequency
The mass air flow (MAF) sensor is an air flow meter that measures the amount of air entering the engine. The powertrain control module (PCM) uses the MAF sensor signal to provide the correct fuel delivery for all engine speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine indicates an acceleration or high load condition. The MAF sensor has the following circuits:
• An ignition 1 voltage circuit
• A ground circuit
• A signal circuit
The PCM applies a voltage to the sensor on the signal circuit. The sensor uses the voltage to produce a frequency based on the inlet air flow through the sensor bore. The frequency varies within a range of near 2,000 Hertz at idle to near 10,000 Hertz at maximum engine load. If the PCM detects the frequency signal is less than the possible range of a correctly operating MAF sensor DTC P0102 sets
• Inspect the harness of the MAF sensor to verify that it is not routed too close to the following components:
- The secondary ignition wires or coils
- Any solenoids
- Any relays
- Any motors
• Inspect for any contamination or debris on the sensing elements of the MAF sensor.
• A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 3-10 g/s at idle to 150 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.
• A high resistance of 15 ohms or more on the ground circuit or the ignition 1 circuit of the MAF sensor may cause this DTC to set. A high resistance may cause a driveability concern before this DTC sets.
Start the engine.
Observe the Mass Air Flow (MAF) Sensor parameter with a scan tool.
Is the MAF Sensor parameter less than the specified value?
Go to Step 4
Go to Step 3
Observe the Freeze Frame/Failure Records for this DTC.
Turn OFF the ignition for 30 seconds.
Start the engine.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?
Go to Step 4
Go to Diagnostic Aids
Brake bleeding Procedure
1. First, you have to depress pin location (see Image)
Keep this pin block so it will not pop out during the bleeding otherwise air will stay trap inside the system.
2. Start bleeding the Brake cylinder that is the farthest from the Brake master cylinder. Do the 4 wheels in the same matter.
Get this manual online at www.reliable-store.com and get complete guide on whether to repair or not, service it, and how to repair etc, along with wiring diagrams, electrical diagrams, torque specs, error codes, everything.
The problem is probably a faulty diverter door actuator or vacuum problem at the HVAC plenum under the dash. This is a common problem - see YouTube for help diagnosing this:
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It looks to me you need a new or remanufactured cluster but ... find a wiring diagram for that cluster and with a test light checks the + wires(sometimes there is more than one +) and the ground on the wiring diagram. You will need to remove the cluster itself for the backprobe wire's test at the cluster terminals.