Circuit Description
The crankshaft position (CKP) sensor B is a 7X variable reluctance sensor. This produces 7 digital ON/OFF pulses per engine revolution. These pulses occur when a reluctor wheel, mounted to the crankshaft and containing 6 slots evenly spaced 60 degrees apart and one slot spaced at 10 degrees, passes by the sensor. The 7X sensor is connected directly to the ignition control module (ICM). The sensor wiring includes 2 circuits, a CKP senor signal circuit, and a low reference circuit. The ICM uses the 7X signal to determine the engine position and speed. There are no DTCs to diagnose the CKP sensor B. This CKP sensor system diagnosis is used to diagnose a fault with the CKP sensor B and the CKP sensor B circuits.
Step | Action | Values | Yes | No | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Component Views , Engine Controls Connector End Views , or Powertrain Control Module Connector End Views | ||||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | ||||||||||
2 |
Does the scan tool display a 3X crank sensor RPM ? | -- | Go to Intermittent Conditions | Go to Step 3 | ||||||||||
3 |
Does the test lamp illuminate? | -- | Go to Step 7 | Go to Step 4 | ||||||||||
4 |
Does the test lamp illuminate? | -- | Go to Step 8 | Go to Step 5 | ||||||||||
5 | Measure the resistance from the CKP sensor signal circuit to the low reference circuit of the CKP sensor B with a DMM. Refer to Circuit Testing in Wiring Systems. Is the resistance within the specified range? | 800-1200 ohms | Go to Step 10 | Go to Step 6 | ||||||||||
6 | Test the CKP sensor B circuits for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 9 | ||||||||||
7 | Repair the short to ground in the CKP sensor signal circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 16 | -- | ||||||||||
8 | Repair the short to voltage in the CKP sensor signal circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 16 | -- | ||||||||||
9 | Test the CKP sensor B circuits for the following conditions:
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 11 | ||||||||||
10 | Test for an intermittent and for a poor connection at the ICM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 12 | ||||||||||
11 | Test for an intermittent and for a poor connection at the CKP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 | ||||||||||
12 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 | ||||||||||
13 | Inspect the crankshaft reluctor wheel for the following conditions:
Refer to Crankshaft and Bearing Cleaning and Inspection in Engine Mechanical. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 15 | ||||||||||
14 | Replace the CKP sensor B. Refer to Crankshaft Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||||||
15 | Replace the ICM. Refer to Ignition Control Module Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||||||
16 |
Does the vehicle operate normally, with no MIL? | -- | System OK | Go to Step 2 | ||||||||||
