Engine Cranks But Does Not Run. Isuzu S/T Isuzu

For 1990-2009 cars only

Makes 🢒 Isuzu 🢒 2001 🢒 S/T Isuzu - 4WD 🢒 Engine 🢒 Engine Electrical 🢒 Engine Cranks But Does Not Run

Circuit Description

Important: The camshaft position (CMP) sensor is only used for a misfire detection and is not part of the ignition system.

This engine is equipped with a distributorless ignition system called the electronic ignition (EI) system. The primary circuit of the EI system consists of the following components:

•	Two separate ignition coils

•	An electronic ignition control module (ICM)

•	A crankshaft position (CKP) sensor

•	Related connecting wires

•	The ignition control (IC) portion of the powertrain control module (PCM)

Each secondary circuit consists of the following components:

•	The secondary winding of the coil

•	The spark plug wires

•	The spark plugs

Diagnostic Aids

Test or inspect for the following conditions:

•	Collapsed air intake duct

•	Retricted air filter element--Refer to Air Cleaner Element Replacement .

•	A throttle position (TP) sensor that reads too high or skewed may cause an incorrect fueling condition

•	A TP sensor binding or sticking in wide open position

•	A TP sensor shorted or open

•	Fuel contamination

•	Lack of fuel

•	Low compression--Refer to Engine Compression Test in Engine Mechanical.

•	A cold engine that has not been started should display ECT and IAT temperatures that are relatively close to each other.

•	A skewed MAP sensor--The MAP sensor value should change when cranking the engine. Compare any questionable barometer readings with that of a known good vehicle.

Check for intermittent conditions. Refer to Intermittent Conditions .

Test Description

The number below refers to the step number on the diagnostic table.

While cranking the engine, the CKP activity, or the CKP reference signal, should increment to 255, and rollover to 0.

Step	Action	Values	Yes	No
1	Did you perform the Diagnostic System Check-Engine Controls?	--	Go to Step 2	Go to Diagnostic System Check - Engine Controls .
2	With the scan tool, observe the CKP activity counter while cranking the engine. Does the CKP activity counter increment while cranking the engine?	--	Go to Step 3	Go to Electronic Ignition (EI) System Diagnosis
3	With the scan tool, command the fuel pump ON. Does the fuel pump run?	--	Go to Step 4	Go to Fuel Pump Electrical Circuit Diagnosis .
4	Turn OFF the ignition. Caution: Remove the fuel tank cap and relieve the fuel system pressure before servicing the fuel system in order to reduce the risk of personal injury. After you relieve the fuel system pressure, a small amount of fuel may be released when servicing the fuel lines, the fuel injection pump, or the connections. In order to reduce the risk of personal injury, cover the fuel system components with a shop towel before disconnection. This will catch any fuel that may leak out. Place the towel in an approved container when the disconnection is complete. Relieve the fuel pressure. Refer to Fuel Pressure Relief . Install a fuel gage. Turn ON the ignition, with the engine OFF. Does the fuel pressure read within the specified value?	248-325 kPa (41-47 psi)	Go to Step 5	Go to Fuel System Diagnosis .
5	Turn OFF the Ignition. Disconnect a fuel injector connector. Install a fuel injector test lamp into the connector. Crank the engine. Does the test lamp blink while cranking the engine?	--	Go to Step 6
6	Install a J 26792 spark tester on spark plug wire 1, leaving the other wires connected. Crank the engine while observing the spark tester. Repeat the procedure on the remaining cylinders. Did spark occur on all cylinders?	--	Go to Step 7	Go to Electronic Ignition (EI) System Diagnosis .
7	Turn OFF the Ignition. Inspect for faulty spark plugs. Refer to Spark Plug Inspection . Did you find and correct the condition?	--	Go to Step 8	Go to Diagnostic Aids
8	Start the engine. Does the engine start and continue to run?	--	Go to Diagnostic System Check - Engine Controls .	Go to Step 2