Engine Controls - Basic Testing: Other Honda CR-V I

Compression

Check engine mechanical condition with a compression gauge, vacuum gauge, or an engine analyzer. See engine analyzer manufacturer's manual for specific instructions.

Check compression pressure with engine at normal operating temperature, all spark plugs removed, throttle valves wide open and at specified cranking speed. Crank engine at least 6 revolutions to determine engine compression. See ENGINE COMPRESSION .

ENGINE COMPRESSION (1)

Exhaust System Backpressure

Exhaust system can be checked using a vacuum or pressure gauge. Remove front (primary) heated oxygen sensor (HO2S). Connect a 0-5 psi pressure gauge, and run engine at 2500 RPM. If exhaust system backpressure exceeds 1 3/4 - 2 psi (.12-.14 kg/cm 2 ), exhaust system or catalytic converter is plugged.

If using a vacuum gauge, connect vacuum gauge hose to intake manifold vacuum port and start engine. Observe vacuum gauge. Open throttle part way and hold steady. If vacuum slowly drops after stabilizing, check exhaust system for restrictions.

FUEL SYSTEM

Note. Before disconnecting battery or removing radio fuse, obtain anti-theft code for radio. After battery is reconnected, CODE will appear on radio display. Enter 5-digit code to restore radio operation. If code is entered wrong 3 times, leave radio on at least one hour, then enter code correctly. Any time radio power is lost, pre-selected radio stations will have to be set. For more information, see owners manual.

FUEL SYSTEM PRESSURE RELEASE

Remove negative battery terminal. Remove fuel tank filler cap. Locate 12-mm banjo bolt on fuel filter. Place clean shop rag around banjo bolt and slowly loosen 12-mm bolt one complete turn while holding fuel filter. Always replace washers after loosening or removing bolts or nuts.

FUEL PRESSURE

Note. If vehicle starts and runs, fuel pump main relay is okay.

Spark

Check for spark at secondary coil wire and each spark plug wire using a spark tester. Check spark plug wire resistance on suspect wires. Resistance should be less than 25,000 ohms at 68°F (20°C).

Scheme 1

1. Turn ignition off. Remove primary and secondary leads from ignition coil. Using an ohmmeter, check primary resistance between ignition coil connector terminals "A" and "B". (Scheme 1) Resistance should be as specified. See «IGNITION COIL RESISTANCE»(ref-16246-S16219649372001010800000).
2. Check secondary resistance between ignition coil connector terminal "A" and secondary output terminal (coil tower). See «IGNITION COIL RESISTANCE»(ref-16246-S16219649372001010800000). Check for continuity between terminals "A" and "C". Continuity should exist. If readings are not within specification, replace coil.

Scheme 2

1. Turn ignition off. Remove distributor cap. Remove primary leads from ignition coil. Using an ohmmeter, check primary resistance between ignition coil terminals "A+" and "B-". (Scheme 2) Resistance should be as specified. See «IGNITION COIL RESISTANCE»(ref-16246-S16219649372001010800000).
2. Check secondary resistance between ignition coil terminal "A" (+) and secondary output terminal (coil tower). See «IGNITION COIL RESISTANCE»(ref-16246-S16219649372001010800000). If readings are not as specified, replace ignition coil. IGNITION COIL RESISTANCE - Ohms @ 68°F (20°C) Application Primary Secondary CR-V.63-.77 12,800-19,200

IGNITION CONTROL MODULE

Note. If MIL comes on, check for Diagnostic Trouble Codes (DTCs). See appropriate testing in TESTS W/CODES article. Before preforming IGNITION CONTROL MODULE (ICM) INPUT TEST, ensure ignition, fuel and emissions systems are operating properly. Ignition Control Module (ICM) is located in distributor housing. (Scheme 3)

Scheme 3

1. Turn ignition off. Remove distributor cap, rotor and leak cover. Disconnect wires from ICM. (Scheme 3) Turn ignition on. Check for voltage between ground and Black/Yellow wire. If battery voltage exists, go to next step. If battery voltage does not exist, check Black/Yellow wire between fuse No. 9 (15-amp) in underdash fuse/relay box and ICM. See the «WIRING DIAGRAMS»(ref-16319) article. Repair wire as necessary.
2. Turn ignition on. Check for voltage between ground and White/Blue wire. If battery voltage exists, go to next step. If battery voltage does not exist, check ignition coil. Replace coil as necessary. If ignition coil is okay, check for an open in White/Blue wire between ICM and ignition coil. See the «WIRING DIAGRAMS»(ref-16319) article.
3. Check for continuity in Blue wire between tachometer test connector and ICM. If continuity exists, go to next step. If continuity does not exist, repair open in Blue wire.
4. Check for continuity between ground and Blue wire. If continuity exists, repair short to ground in Blue wire. If continuity does not exist, wiring is okay. Replace ICM.

IDLE SPEED & IGNITION TIMING

Ensure idle speed and ignition timing are set to specification. See IDLE SPEED SPECIFICATIONS and IGNITION TIMING . For adjustment procedures, see the ADJUSTMENTS article. Before checking or adjusting idle, ensure MIL has not been reported on, timing is correct, and that spark plugs, air cleaner and PCV system are okay.

IDLE SPEED SPECIFICATIONS

IDLE CO LEVEL

FAST IDLE SPEED SPECIFICATIONS

IGNITION TIMING - Degrees BTDC - RED MARK @ RPM

SUMMARY

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed to the TESTS W/CODES article. If no hard codes are found in self-diagnostics, proceed to the TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO-START, etc.), or intermittent diagnostic procedures.