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Trouble code 93

Problem circuit starter signal

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Plz be more specific with description

Posted on Mar 30, 2008

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O5 Colorado got the ecm code when I shut off the truck and now it won't turn over


What ECM code ? What is everything else that is working ? Headlamps , inside lighting , radio etc... When you turn the key on do the instrument cluster warning lights come on then off a few seconds later ? Anti-theft (security light ) On ? Flashing ? Do you know what all is involved ,or happens when you turn the key to start ?
Circuit Description (ECM/PCM Controlled)
Moving the ignition switch to the START position sends a 12-volt signal to the engine control module (ECM)/powertrain control module (PCM) Crank Request circuit. The ECM/PCM verifies that the transmission is in the PARK or NEUTRAL position. With the transmission in Park, voltage flows through the Park/Neutral position switch and feeds the starter relay coil. The PCM then grounds the control circuit of the starter relay. When the starter relay is energized it allows battery positive voltage to the starter solenoid S terminal. On some vehicles the starter will continue to crank the engine with the key released until it starts or the crank command has timed out to prevent excessive heat build up in the starter circuitry or the ECM/PCM receives an engine run flag.
Circuit Description (BCM Controlled)
Moving the ignition to the START position signals the body control module (BCM) that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the powertrain control module (PCM) requesting engine start. The BCM also energizes the RUN/CRANK RELAY. When the RUN/CRANK RELAY switch side closes, and the vehicle is in Park or Neutral or with the clutch is fully depressed, if equipped, supplies voltage to the starter relay coil. The PCM verifies the transmission is in Park or Neutral and the clutch is fully depressed, if equipped. The PCM will then ground the control circuit of the starter relay, closing the switch supplying voltage to the starter solenoid. On some vehicles the starter will continue to crank the engine with the key released until it starts of the crank command has timed out to prevent excessive heat build up in the starter circuitry or the PCM receives an engine run flag.


Verify that no starter relay, immobilizer, or automatic transmission DTCs are set that would cause the PCM to disable starting.
? If the specified DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Ignition ON, observe the scan tool PCM Ignition 1 Signal parameter with a scan tool. The reading should be greater than 10.0 Volts.
? If less than the specified value, test the ETC, PCM 1, and PCM B fuses, the RUN/CRNK relay, and the PCM ignition voltage circuits for an open/high resistance. If the circuits test normal, replace the PCM.
Ignition OFF, remove the START relay.
Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
? If the test lamp does not illuminate, test the START fuse and the B+ circuit for an open/high resistance.
Ignition ON, transmission in Park or clutch pedal pressed, verify that a test lamp illuminates between the PNP/clutch start switch signal circuit terminal 86 and ground.
? If the test lamp does not illuminate, test the IGN fuse, RUN/CRANK relay, PNP/clutch switch ignition voltage circuit, and the signal circuit for a short to ground or an open/high resistance. If the circuits test normal, test or replace the PNP switch or the clutch start switch.
Connect a test lamp between the park/neutral signal circuit terminal 86 and the relay coil control circuit terminal 85.
Ignition ON, transmission in Park, or clutch pedal pressed, turn the ignition switch between the START and RUN positions. The test lamp should turn ON and OFF when changing between the commanded states.
? If the test lamp is always ON, test the relay control circuit for a short to ground. If the circuit tests normal, replace the PCM.
? If the test lamp is always OFF, test the relay control circuit for a short to voltage or an open/high resistance. Test the PNP/clutch start switch signal circuit for an open/high resistance. If the circuits test normal, replace the PCM.
Install the START relay.
Connect a test lamp between the starter solenoid terminal and ground.

Mar 12, 2017 | Cars & Trucks

1 Answer

How to fix code p0452 on 2005 Explorer


Trouble Code: P0452

FTP Sensor Circuit Low Input

Possible Causes:


FTP sensor signal circuit is open or the ground circuit is open.FTP sensor signal circuit is shorted to VREF (5v).FTP sensor is damaged or the PCM has failed.Now you have to figure out what FTP is.Trouble Code: P0453

FTP Sensor Circuit High Input

Possible Causes:


FTP sensor signal circuit is open or the ground circuit is openFTP sensor signal circuit is shorted to VREF (5v)FTP sensor is damaged or the PCM has failed.Here's a link.

Jan 01, 2013 | Ford Explorer Cars & Trucks

1 Answer

Engine management light on trouble code P0335


P0335 - Crankshaft Position Sensor 'A' Circuit Malfunction

Possible causes- Faulty crankshaft position sensor (most common)
- Crankshaft position sensor harness is open or shorted
- Crankshaft position sensor circuit poor electrical connection
- Signal plate may be damage
- Starter motor may be faulty
- Starting system circuit
- Dead or weak battery causing slow engine crank over.

Oct 25, 2012 | 2005 Fiat Punto

1 Answer

How do i fix trouble code 122 and 102


Throttle position sensor and maf sensor are displayed for these codes.Trouble Code: P0122

TP Sensor Circuit Low Input

Possible Causes:


TP sensor signal circuit is shorted to sensor ground.TP sensor signal circuit is open (except 1996-1998 models).TP sensor VREF circuit is open between sensor and PCM.TP sensor is damaged or it failed (it may be shorted).PCM is damaged or has failed.Trouble Code: P0102

MAF Sensor Circuit Low Frequency

Possible Causes:


MAF sensor element hot wire contaminated or the sensor failed.MAF sensor signal shorted to ground or ground circuit problem.MAF sensor wiring routed close to the ignition wires, generator, solenoids or electric motors.PCM has failed.Click on link to view how to replace.http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0996b43f80cb3c01

Oct 19, 2012 | 2003 Chevrolet Impala

1 Answer

Truck will be running fine, then all of a sudden it will completely shut off. After we wait a few minutes and pump the clutch and make sure it is all the way to the floor it will start, sometimes. S


You need the engine computer scanned for fault codes, i thank you have an ignition control problem like a module or distributor pickup coil issue. These parts whenthey fail should leave fault cdes so get them read.
Next, the check engine light will pause shortly followed by the second digit of the trouble code. For example if the check engine light blinks once and pauses followed by six blinks the trouble code number would be 16. If no code is present the check engine light will stay one constantly. To restart code gathering turn the ignition key to the "off" position, wait three minutes and turn the ignition key back "on" again without starting the engine. Remove the jumper wire once code gathering is complete. To clear code after the repairs have been made remove the negative battery cable for one minute and reconnect.
toyota_dianostic_connector.jpg
Toyota Diagnostic Connector
Toyota Code Definition Table
Code 11 Momentary interruption in power supply to ECU (electronic control unit or computer) up to 1991
Code 12 Engine revolution signal missing Code 13 Rpm signal to ecu missing above 1000 rpm
Code 14 Igniter signal to ecu missing
Code 16 A/T control signal missing from ecu
Code 21 Main oxygen sensor signal fault
Code 22 Water temperature sensor circuit fault
Code 23 and 24 Intake air temperature signal fault
Code 25 Air/fuel ratio LEAN
Code 26 Air/fuel ratio RICH
Code 27 Sub-oxygen sensor signal or heater circuit fault
Code 28 No. 2 oxygen sensor/heater signal fault
Code 31 and 32 Air flow meter circuit or Vacuum sensor signal fault Code 34 and 36 Turbo-charging pressure signal fault
Code 35 Altitude compensation sensor signal fault
Code 41 Throttle position circuit fault
Code 42 Vehicle speed sensor circuit
Code 43 No starter signal to the ecu
Code 51 AC signal on; DL contact off (in transmission shifter with diagnostic connector jumped)
Code 52, 53 and 55 Knock sensor fault Code 71 EGR system malfunction
Code 72 Fuel cut solenoid signal fault
Code 78 Fuel pump control signal fault
Code 81, 83, 84 and 85 TCM communication fault

Jun 28, 2012 | Cars & Trucks

1 Answer

How do you fix a PO113 & PO123 code on a 02 Jeep Grand Charokee Larado 4.0



Trouble Code: P0113

IAT Sensor Circuit High Input
Possible Causes:


IAT Sensor signal circuit shorted to VREF (5v) IAT Sensor signal circuit is open, or the ground circuit is open


Trouble Code: P0123

TP Sensor/APPS Circuit High Input
Possible Causes:


Related TP Sensor engine DTCs present Intermittent wiring or connector problem TP signal circuit is open or is shorted to battery voltage or to 5v supply circuit TP sensor has failed TP sensor ground circuit is open PCM has failed IAT Sensor is damaged or it has failed (an internal open circuit) PCM has failed

Jun 02, 2012 | 2002 Jeep Grand Cherokee

1 Answer

My '93 suzuki sidekick automatic transmission 4 wheel drive after warm up "overdrive off" starts flashing on and off and when on the drivetrain stops working


The O/D light's flashing means there is some kind of transmission trouble.

The codes are..


Trouble Code (1) Probable Cause
12 ............................... System Operation Normal
21 ..................... No. 1 Shift Solenoid Open Circuit
22 .................... No. 1 Shift Solenoid Short Circuit
23 ..................... No. 2 Shift Solenoid Open Circuit
24 .................... No. 2 Shift Solenoid Short Circuit
25 ............................. TCC Solenoid Open Circuit
26 ............................ TCC Solenoid Short Circuit
31 ............ Vehicle Speed Sensor Open Or Short Circuit
32 ................ Throttle Position Sensor Short Circuit
33 ................. Throttle Position Sensor Open Circuit
34 ................ Defective Park/Neutral Position Switch
36 .............. (2) No Signal-Both Vehicle Speed Sensors
(1) - Check listed component for probable cause. Also check wiring and connections of specified component.
(2) - No signal from both transmission and speedometer mounted vehicle speed sensors.

If a trouble code is present, OD OFF light will flash a trouble code. The number of flashes will equal first digit of trouble code. After a one second pause, second digit will be displayed. If more than one trouble code is present, next trouble code will be displayed after a 3 second pause. Smallest number trouble code will be displayed first. Trouble codes will be repeated.

Hope this gave you some insight on the issue.

Mar 08, 2011 | 1993 Suzuki Sidekick

1 Answer

Mercedes benz B-170 after 50 km the code is coming 0793 (a0, 1, 7, 93) please refer to relevant technical manual and code 0722(a0, 1, 7, 22) check by scaner X431 what problem


P0793....Intermediate Shaft Speed Sensor Circuit No Signal


P0722....Output Speed Sensor Circuit No Signal

would need a manual to know where these sensors were to be honest

Dec 13, 2010 | Mercedes-Benz B-Class Cars & Trucks

1 Answer

Trouble codes


Trouble Code: P0139
O2 (B1 S2) Slow Response
Trouble Code Conditions:Engine started; vehicle driven at 20-55 mph with the throttle open for 2 minutes; ECT at more than 158ºF (70C); catalytic converter temperature is more than 1112F (600C); and EVAP purge is active. O2 Sensor signal voltage switches less than 16 times from lean to rich within 20 seconds during monitoring, or will compare the state of change between the front and rear O2 Sensors and if the differences are greater than a calibrated amount, the DTC will set. 3 good trips are required to turn off the MIL.
Possible Causes:
  • Exhaust leak
  • O2 element is contaminated, deteriorated or it has failed
  • O2 signal circuit or return circuit has failed

Trouble Code: P0344
Camshaft Position Sensor Circuit Intermittent
Trouble Code Conditions:Engine cranking or running; system voltage over 10.5v. The PCM detected an intermittent loss of the CMP Sensor signal during the period of 2.5 complete engine revolutions. The failure counter must reach 20 before this code matures and a code is set.
Possible Causes:
  • Wiring harness fault
  • 5v supply circuit open or shorted to ground
  • Tone wheel/pulse ring is damaged or corroded
  • CMP Sensor has failed
  • CMP Sensor signal circuit is open, shorted to ground or battery voltage or 5v supply
  • CMP Sensor ground circuit is open
  • PCM has failed
  • Trouble Code: P0340
    No Camshaft Position Sensor Circuit Failure
    Trouble Code Conditions:Engine cranking or running, system voltage over 10v. The PCM detected CKP pulses without detecting any CMP Sensor pulses for 5 seconds or 2.5 engine revolutions.
    Possible Causes:
  • CMP Sensor connector is damaged, open or it is shorted
  • CMP Sensor signal circuit is open or shorted to ground or to battery voltage or 5v supply circuit
  • CMP Sensor 5v supply circuit is open or shorted to ground or to battery voltage
  • CMP Sensor ground circuit is open
  • CMP Sensor is damaged or has failed
  • CKP Sensor is damaged or has failed
  • PCM has failed
Good luck....

Nov 05, 2008 | 2005 Chrysler PT Cruiser

1 Answer

Obd1 trouble code


25) is mixture control continuously lean
42) is VSS circuit - vehicle speed sensor
43) is starter signal circuit
Good luck and I hope this answers your question. And remember to rate all the solutions that you get, thanx.

Oct 30, 2008 | 1995 Toyota Camry

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