GM Repair Questions? Ask a Mechanic for Answers ASAP
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Some customers may complain of an intermittent crank no start, no crank, SES light, and/or security light. Upon inspection, the technician may find low fuel pressure and/or any of the following DTCs: P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P069E, P0102, P0113, P0118, P0131, P0132, P0135, P0137, P0140, P0141, P0161, P0230, P0335, P0341, P0151, P0152, P0155, P0157, P0158, P0161, P0171, P0172, P0174, P0175, P0449, P0452, P0532, P0641, P069E, P1133, P1153, P1682, P2101, P2534, and/or P2544.
If the SI diagnostics do not isolate a cause for this concern, inspect the wiring harness above the front drive shaft for a potential short to ground, near the transfer case side of the front drive shaft as shown below. Repair any chaffed wires by following SI repair procedures.
The harness should be secured to a supporting bracket with a plastic clinch style clip. If the harness has contacted the front drive shaft because of a missing retaining clip, secure the harness to the metal fuel line bracket with a tie strap to prevent a reoccurrence. If the retaining clip is present but contact still occurred, relocate the inboard clip (part of the wiring harness) and tie strap the harness to prevent a reoccurrence.
Here is an example of a harness that is too close:
is there anything else, those wires are fine
Short to Ground
Short to Voltage
Ignition 1 Voltage Powertrain Relay
Ignition 1 Voltage-Run/Crank Relay
Operating Conditions: Ignition ON, Engine OFF, Run/Crank Relay and Powertrain Relay are commanded ON
Ignition 1 Voltage Run Crank Relay
EC Ignition (Powertrain) Relay Feedback Signal
There are 2 ignition 1 voltage circuits supplied to the engine control module (ECM). The first ignition circuit is provided by the powertrain relay, through a fuse. This ignition 1 voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation. The second ignition 1 voltage circuit is supplied by the run/crank relay through a fuse, and is used to power the remaining internal ECM circuits. If the ECM detects a voltage difference between the 2 ignition 1 voltage circuits, DTC P1682 will set.
The ECM detects that the voltage level difference is greater than 3 volts between the 2 ignition 1 voltage circuits.
DTC P1682 is a Type A DTC.
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
Engine Controls Schematics
Electronic Ignition (EI) System Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
J 35616 Connector Test Adapter Kit
Important: On the scan tool, the Powertrain Relay is referred to as the EC Ignition Relay.
Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
Important: A resistance of 6 ohms or greater in the circuit/underhood fuse block will cause the DTC to set.
Do you have the location of the ignition circuits
They are listed in this schematic. You can do pinout testing right at the UBEC and PCM.
I have extendended crank times and I also have experieced turn the key on and nothing like the battery is dead. What are the culprits here
which pin is 30
using a volt meter testing the 30
run crnk relay .1
pwr trn relay .38
black on B- and red on 30 key on position
meter set on 12v
I .05 I 0
I equals the leg of the relay
I 11.71 I 11.71 This is the pwr/trn
- o - .01
-11.70 - 11.05 This is run crank