Question about 2000 Jeep Cherokee

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Tired of replacing crank censors

Have replaced the crank sensor 3-4 times within the past three years. Problem is back. Could the problem be in the fan or somewhere else?

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  • Master
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The gap between the sensor and the crank could be another issue. There must some gap, not too much and not too little. If the sensor will pick to a range of 1/4", there is no reason to set it 1/64" from the crank.

Posted on Mar 12, 2009

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  • Jeep Master
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Crank sensor life is determined by quality of part. Generally the OEM sensors from dealer are better than the generic ones offered by many parts houses.
Fan or other systems do not cause sensor failure. As long as you maintain normal operating temps and are not overheating the engine, there is no reason to draw a connection between those systems.

Posted on Mar 12, 2009

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My 2001 Malibu has 3100 engine..turns over but not firing but getting gas..replaced crankshaft censor,camshaft censor,ignition control module,coil packs and theft light is not on.


Did you check for battery positive voltage at the pink wire at the ignition module , you have three connectors ,one with 4 an two with two wires , the one with pink an black ,that's power an ground . is there power an ground ? Which crankshaft position sensor did you replace , yours has two ! crank sensor A an crank sensor B . A is an input to the PCM - engine computer , B is an input to the ignition module .Does your check engine light come on when you turn on the key ? an go off when you crank the engine ? You tested for spark at the coil ? Pull two pull wires on same coil an crank over the engine , is there spark jumping from one terminal to the other ?
Engine Cranks But Does Not Run
Inspect for the following conditions:
?€¢
Mass air flow (MAF) is compared to a calculated mass air flow based upon the manifold absolute pressure (MAP), throttle position (TP), and engine RPM readings. A skewed or unresponsive MAP sensor at KEY ON will cause the predicted air flow value to be inaccurate. Compare MAP and TP sensor value to that of a known good vehicle.


?€¢
A faulty engine coolant temperature (ECT) sensor. Compare the ECT with intake air temperature (IAT) on a completely cool engine with a scan tool. The ECT should be within 3?°C (5?°F) of the IAT. If not, refer to DTC P0128 .


You need a scan tool to check this stuff !
1
Did you perform the Diagnostic System Check-Engine Controls?
--
Go to Step 2
Go to Diagnostic System Check - Engine Controls

2

  1. Turn ON the ignition, with the engine OFF.
  2. Observe the DTC information with a scan tool.
Does the scan tool display DTC P0101, P0123, P0230, P0601, P0602, P1626, P1630, or P1631?
--
Go to Diagnostic Trouble Code (DTC) List
Go to Step 3

3

  1. Turn ON the ignition, with the engine OFF.
  2. Inspect the following fuses for an open:
?€¢
F/P INJR


?€¢
ELEK IGN


?€¢
F/PMP

Did you find an open fuse?
--
Go to Step 10
Go to Step 4

4

  1. Attempt to start the engine.
  2. Monitor the engine RPM parameter while the engine is cranking with a scan tool.
Does the engine RPM parameter display cranking RPM?
--
Go to Step 5
Go to Electronic Ignition (EI) System Diagnosis
  1. Monitor the Cylinder 1-6 Injector Circuit Status parameter with a scan tool.
  2. Crank the engine.
Do all of the Cylinder Injector Circuit Status parameters display OK?
--
Go to Step 6
Go to Fuel Injector Circuit Diagnosis

6

Command the fuel pump ON with a scan tool.
Does the fuel pump turn ON?

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