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HAD DIGNOSTIC PERFORMED COMES UP P1635 - 1998 Chevrolet Malibu

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This means ignition coil

Posted on Oct 02, 2009

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Posted on Jan 02, 2017

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03 chevy impala how to fix pocode 1635 is this the computer are what is it


DTC P1635
The powertrain control module (PCM) provides 5 volts to the following sensors:
?€¢
The manifold absolute pressure (MAP) sensor


?€¢
The exhaust gas recirculation (EGR) valve


?€¢
The fuel tank pressure (FTP) sensor


?€¢
The throttle position (TP) sensor

These 5-volt reference circuits are independent of each other outside the PCM, but are bussed together inside the PCM. Therefore a circuit condition on one sensor 5-volt reference circuit may affect the other sensor 5-volt reference circuits. The PCM monitors the voltage on the 5-volt reference circuit. If the PCM detects that the voltage is out of tolerance, DTC P1635 sets.
Diagnostic Aids
?€¢
If any sensor using a 5-volt bias voltage, such as the intake air temperature (IAT) sensor or fuel sensor, is shorted to voltage, DTC P1639 may set in addition to DTC P1635.


?€¢
For an intermittent condition, refer to Intermittent Conditions .


Does the vehicle start an run ?

Jun 11, 2015 | 2003 Chevrolet Impala

1 Answer

My car is 2009 toyota matrix with lights out on my dashboard dignostic test reading p2118


code p 2118 refers to throttle actuator control (TAC) throttle motor current---range /performance problem====causes --wiring---throttle motor

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1 Answer

Car accelerates by itself; idles way too fast


Focus on the P1635. The pcm is not providing a valid reference voltage to the sensors. Therefore, the sensors are unable to provide feedback to the pcm. This problem can be the pcm itself or a short somewhere on the wire that is supplying the reference voltage. I would unplug the sensors and then check to see if the reference voltage comes up to spec (5vdc). If it doesn't, trace the wires looking for a short to ground. No short--replace pcm. If you find a short, repair. If the voltage meets spec with the sensors unplugged, plug them bacl one at a time checking the voltage after each one is plugged back in until the voltage drops. When it drops, you have found the sensor that is the source of the short. Am I making sense? Then put your old tps back on.

Jul 11, 2017 | 1996 Oldsmobile Cutlass Ciera

1 Answer

P1635


3800 engine it is behind the harmonic balancer (crank pulley) on the right side.
3400 engine it is above the oil pan on passenger firewall side of engine.

Oct 09, 2012 | 2002 Pontiac Montana

2 Answers

P1635


P1635- 5 VOLT REFERENCE 1 CIRCUIT.
DESCRIPTION- the PCM uses the 5 v. reference 1 circuit to feed the throttle position sensor, MAP sensor EGR position sensor and the fuel tank pressure sensor with 5 volts. The engine computer monitors this voltage while the engine is running and will set the p1635 code if this 5 volt reference is out of its parameters.

Nov 09, 2009 | 2001 Chevrolet Malibu

4 Answers

98 Saturn SL2 - Stalling issues


I had a problem with starts on my 98 sc2, did it twice only, but it would start up, shake a bit then shut down like it wasn't getting fuel, or a wrong mixture. Replaced the coolant temperature sensor and starts / idles like new now... goodluck

Jun 22, 2009 | 1998 Saturn SL

1 Answer

Code p1635


The P01535 refers to the 5 volt reference circuit generated by the PCM. The reference voltage is being pulled low for some reason.
If there are no other codes present, the code is indicating the PCM 5 volt output is too low caused by an internal PCM failure.
If you have a volt meter, check the voltage at the TPS ( gray wire and key in run position ) and see what the actual voltage is.
Let me know and we can go from there.
Regards,

Apr 23, 2009 | 2000 Pontiac Grand Prix

1 Answer

Dtl says p1635, 5 voltage (1 or "a" curcuit)


What engine ? 3.1 or 3.8 L
DTC P1635 5 Volt Reference Circuit , do you know what this is ?
The PCM uses the 5-volt Reference A circuit as a sensor feed to the following sensors:
• The TP sensor
• The MAP sensor
• The EGR valve pintle position sensor.
The PCM monitors the voltage on the 5-volt Reference A circuit. If the voltage is out of tolerance, DTC P1635 will set.
Diagnostic Aids
Important:: Be sure to inspect PCM and engine grounds for being secure and clean.
Inspect for the following conditions:
Many situations may lead to an intermittent condition. Perform each inspection or test as directed.
Important: : Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.
• Loose terminal connection
- Use a corresponding mating terminal to test for proper tension. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair.
- Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair.
• Damaged harness--Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair.
• Inspect the powertrain control module (PCM) and the engine grounds for clean and secure connections. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair.
If the condition is determined to be intermittent, reviewing the Snapshot or Freeze Frame/Failure Records may be useful in determining when the DTC or condition was identified.
DTC P1635 - 5 Volt Reference A Circuit Step
Action
Values
Yes
No
1
Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?
--
YES - Go to Step 2
NO - Go to Powertrain On Board Diagnostic (OBD) System Check - Automatic Transmission
2
Check the PCM and the engine grounds. Ensure that the grounds are clean and secure.
If you find a problem, repair the condition as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
--
YES - Go to Step 11
NO - Go to Step 3
3
Turn OFF the ignition.
Disconnect the EGR.
Turn ON the ignition.
Use a DMM in order to measure the voltage between the 5-volt Reference A circuit and an engine ground.
Is the voltage near the specified value?
5 V
YES - Go to Step 5
NO - Go to Step 4
4
Is the voltage near the specified value?
0 V
YES - Go to Step 6
NO - Go to Step 8
5
Reconnect the EGR valve.
Disconnect the throttle position sensor.
Use a DMM in order to measure the voltage between the 5-volt Reference A circuit and an engine ground.
Is voltage near the specified value?
5 V
YES - Go to Step 10
NO - Go to Step 9
6
Monitor the DMM while disconnecting all other devices that are connected to the 5-volt Reference A one at a time.
If the voltage changes when one of the above components is disconnected, replace the component. Refer to the appropriate replacement procedure.
Did you replace a component?
--
YES - Go to Step 11
NO - Go to Step 7
7
Turn OFF the ignition.
Disconnect the PCM.
Check the 5-volt Reference A circuit for a short to ground.
If you find a problem, repair the condition as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
--
YES - Go to Step 11
NO - Go to Step 10
8
Turn OFF the ignition.
Disconnect the PCM.
Turn ON the ignition.
Check the 5-volt Reference A circuit for a short to voltage.
If you find a problem, repair the condition as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
--
YES - Go to Step 11
NO - Go to Step 10
9
Replace the EGR valve. Refer to Exhaust Gas Recirculation Valve Replacement .
Is the action complete?
--
YES - Go to Step 11
--
10
Important:: The replacement PCM must be programmed.
Replace PCM. Refer to Powertrain Control Module Replacement/Programming .
Is the action complete?
--
YES - Go to Step 11
--
11
Review and record the scan tool Failure Records data.
Clear the DTCs.
Operate the vehicle within the Failure Records conditions.
Use a scan tool in order to monitor the Specific DTC info for DTC P1635 until the DTC P1635 test runs.
Does the scan tool indicate that DTC P1635 failed this ignition?
--
Go to Step 2
System OK
PCM grounds at G113
G113
Lower left front of the engine, on the transaxle stud, near the starter
How to check the 5v reference circuit for short to ground Cadillac

Apr 08, 2017 | 2000 Pontiac Grand Prix

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