Home/Acura/RSX/Acura RSX I facelift (2004-2006)/Repair manual/Testing & Diagnostics/Pgm-Fi System: Component Locations

Contents

Wiring diagrams Section: Testing & Diagnostics

All sections

Pgm-Fi System: Component Locations Acura RSX I facelift

Testing & Diagnostics 24 illustrations ~4734 words

Special Tools Required

Vacuum pump/gauge, 0-30 in.Hg, Snap-on YA4000A or equivalent, commercially available

Note. If some of the DTCs listed below are stored at the same time as DTC P0171 and/or P0172, troubleshoot those DTCs first, then recheck for P0171 and/or P0172.

P0107, P0108, P1128, P1129: Manifold absolute pressure (MAP) sensor

P1166, P1167 *1 , P0135 *2 : A/F sensor (Sensor 1) heater

P0137, P0138: Secondary HO2S (Sensor 2)

P0141: Secondary HO2S (Sensor 2) heater

P0340, P0344: CMP sensor A

P1259, P2646 *2 , P2647 *2 : VTEC system

*1: 2002 model

*2: 2004 model

Scheme 201

Scheme 201: Special Tools Required

Check the fuel pressure (see «FUEL PRESSURE TEST»(ref-218788-S30402187932006021000000) ). Is the fuel pressure OK? YES - Go to step 2. NO - Check these items: If the pressure is too high, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(ref-218788-S00339383882006021000000) ). If the pressure is too low, check the fuel pump, the fuel feed pipe, and the fuel filter, and replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(ref-218788-S00339383882006021000000) ).
Turn the ignition switch OFF.
With the vacuum pump/gauge, 0-30 in.Hg,, apply vacuum to the evaporative emission (EVAP) canister purge valve (A) from the intake manifold side. Does it hold vacuum? YES - Check the valve clearances and adjust if necessary. If the valve clearances are OK, replace the injectors (see «INJECTOR REPLACEMENT»(ref-218785-S20730632042006021000000) ). NO - Replace the EVAP canister purge valve (see «THROTTLE BODY DISASSEMBLY/REASSEMBLY»(ref-218789-S10770291502006021000000) ).

Pressure gauge adaptor 07NAJ-P07010A
A/T low pressure gauge w/panel 07406-0070300
A/T pressure hose 07406-0020201
A/T pressure hose, 2,210 mm 07MAJ-PY4011A
A/T pressure hose, adapter 07MAJ-PY40120
Oil pressure hose 07ZAJ-S5A0200

Note. If the misfire is frequent enough to trigger detection of increased emissions during 2 consecutive driving cycles, the MIL will come on, and DTC P0300 (and some combination of P0301 through P0304) will be stored. If the misfire is frequent enough to damage the catalyst, the MIL will flash whenever the misfire occurs, and DTC P0300 (and some combination of P0301 through P0304) will be stored. When the misfire stops, the MIL will remain on. Troubleshoot the following DTCs first, if any of them were stored along with the random misfire DTC(s)

P0107, P0108, P1128, P1129: Manifold absolute pressure (MAP) sensor

P0171, P0172: Fuel system

P0335, P0339: Crankshaft position (CKP) sensor

P0365, P0369: Camshaft position (CMP) sensor B

P0506, P0507: Idle control system

Scheme 202

Record all freeze data and on-board snapshots with the HDS.
Clear the DTC with the HDS.
Start the engine (in Park or neutral), then let it idle without load.
Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 9 . NO - If the screen indicates PASSED, go to step 5. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, wait for several minutes, and recheck.
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES - Go to step 9 . NO - Go to step 6.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Vehicle speed Throttle position CLV (calculated load value) Gear position
Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 9 . NO - If the screen indicates PASSED, go to step 8. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 6 and recheck.
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES - Go to step 9. NO - Intermittent failure, system is OK at this time.
Turn the ignition switch OFF.
Check the fuel quality. Is the quality good? YES - Go to step 11. NO - Drain the tank and fill it with known-good fuel, then go to step 20 .
Inspect the spark plugs (see «SPARK PLUG INSPECTION»(ref-218768-S42915375172006021000000) ). If the spark plugs are fouled or worn, replace them.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Vehicle speed Throttle position CLV (calculated load value) Gear position
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES - Go to step 14. NO - Go to step 20 .
Check the fuel pressure (see «FUEL PRESSURE TEST»(ref-218788-S30402187932006021000000) ). Is the fuel pressure OK? YES - Go to step 15. NO - If the pressure is too high, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(ref-218788-S00339383882006021000000) ), then go to step 20 . If the pressure is too low, check the fuel pump, the fuel feed pipe, and the fuel filter. If they are OK, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(ref-218788-S00339383882006021000000) ), then go to step 20 .
Turn the ignition switch OFF.
Remove the rocker arm oil pressure switch (VTEC oil pressure switch) (A), and install the special tools as shown, then install the rocker arm oil pressure switch (VTEC oil pressure switch) (A) in the pressure gauge adapter (B). NOTE: Install the switch in the reverse order of removal with a new O-ring.
Reconnect the rocker arm oil pressure switch (VTEC oil pressure switch) 2P connector.
Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on.
Check the oil pressure at engine speeds of 1,000 and 2,000 RPM. Keep the test time as short as possible (less than 1 minute) because the engine is running without load. Is the oil pressure below 49 kPa (0.5 kgf/cm 2 , 7 psi)? YES - Check the fuel pressure (see «FUEL PRESSURE TEST»(ref-218788-S30402187932006021000000) ), and repair as needed, then go to step 20. NO - Inspect the VTEC system, then go to step 20.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Clear the CKP pattern with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-218787-S18900728242006021000000) ).
Do the CKP pattern learn procedure (see «ECM/PCM RESET (2005-2006 MODELS)»(ref-218783-S41815111952006021000000) ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Vehicle speed Throttle position CLV (calculated load value) Gear position
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0300, P0301, P0302, P0303, or P0304 are indicated, check for poor connections or loose terminals at the ignition coil, the injector, and the ECM/PCM, then go to troubleshooting DTC P0301, P0302, P0303, or P0304 (see «DTC P0301: NO. 1 CYLINDER MISFIRE DETECTED (2002-2004 MODELS); DTC P0302: NO. 2 CYLINDER MISFIRE DETECTED (2002-2004 MODELS); DTC P0303: NO. 3 CYLINDER MISFIRE DETECTED (2002-2004 MODELS); DTC P0304: NO. 4 CYLINDER MISFIRE DETECTED (2002-2004 MODELS)»(ref-218785-S14813094082006021000000) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(ref-218785-S20313967292006021000000) . NO - Go to step 27.
Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, go to step 1 and recheck. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 25 and recheck.

Scheme 203

Scheme 203: DTC P0301, P0302, P0303, P0304: No. 1-4 Cylinder Misfire Detected (2002-2004 models)

Scheme 204

Scheme 205

Scheme 206

Scheme 207

Scheme 208

Scheme 209

Scheme 210

Scheme 211

Scheme 212

Scheme 213

After checking and recording the freeze data, reset the ECM/PCM (see «ECM/PCM RESET (2002-2004 MODELS)»(ref-218783-S42639849702006021000000) ). If there is no freeze data of the misfire, just clear the DTC.
Start the engine, and listen for a clicking sound at the injector of the problem cylinder. Does it click? YES - Go to step 3. NO - Go to step 26 .
Turn the ignition switch OFF, and reset the ECM/PCM.
Exchange the ignition coil from the problem cylinder with one from another cylinder.
Test-drive the vehicle several times in the range of the freeze data or under various conditions if there was no freeze data.
Check for a DTC or a Temporary DTC with a scan tool or the HDS. Is DTC or Temporary DTC P0301, P0302, P0303 or P0304 indicated? YES - Go to step 7. NO - Intermittent misfire due to poor contact at the ignition coil connector (no misfire at this time).
Determine which cylinder(s) had the misfire. Does the misfire occur in the cylinder where the ignition coil was exchanged? YES - Replace the faulty ignition coil. NO - Go to step 8.
Turn the ignition switch OFF, and reset the ECM/PCM.
Exchange the spark plug from the problem cylinder with one from another cylinder.
Test-drive the vehicle several times in the range of the freeze data or under various conditions if there was no freeze data.
Check for a DTC or a Temporary DTC with a scan tool or the HDS. Is DTC or Temporary DTC P0301, P0302, P0303 or P0304 indicated? YES - Go to step 12. NO - Intermittent misfire due to spark plug fouling (no misfire at this time).
Determine which cylinder(s) had the misfire. Does the misfire occur in the cylinder where the spark plug was exchanged? YES - Replace the faulty spark plug. NO - Go to step 13.
Turn the ignition switch OFF, and reset the ECM/PCM.
Exchange the injector from the problem cylinder with one from the another cylinder.
Let the engine idle for 2 minutes.
Test-drive the vehicle several times in the range of the freeze data or under various conditions if there was no freeze data.
Check for a DTC or a Temporary DTC with a scan tool or the HDS. Is DTC or Temporary DTC P0301, P0302, P0303 or P0304 indicated? YES - Go to step 18. NO - Intermittent misfire due to bad contact at the injector connector (no misfire at this time).
Determine which cylinder(s) had the misfire. Does the misfire occur in the cylinder where the injector was exchanged? YES - Replace the faulty injector (see «INJECTOR REPLACEMENT»(ref-218785-S20730632042006021000000) ). NO - Go to step 19.
Turn the ignition switch OFF.
Disconnect the ignition coil 3P connector from the problem cylinder.
Turn the ignition switch ON (II).
Measure voltage between ignition coil 3P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 23. NO - Repair open or short in the wire between the No. 1 IGN COIL (15 A) fuse and the ignition coil.
Turn the ignition switch OFF.
Check for continuity between ignition coil 3P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 25. NO - Repair open in the wire between the ignition coil and G101.
Disconnect ECM/PCM connector A (31P).
Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table). TERMINALS REFERENCE PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 A30 YEL/GRN No. 2 P0302 A29 BLU/RED No. 3 P0303 A28 WHT/BLU No. 4 P0304 A27 BRN Is there continuity? YES - Repair short in the wire between the ECM/PCM and the ignition coil. NO - Go to step 27.
Connect the appropriate ignition coil 3P connector terminal No. 1 and body ground with a jumper wire (see table). TERMINALS REFERENCE PROBLEM CYLINDER DTC WIRE COLOR No. 1 P0301 YEL/GRN No. 2 P0302 BLU/RED No. 3 P0303 WHT/BLU No. 4 P0304 BRN
Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table). ECM/PCM TERMINAL REFERENCE PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 A30 YEL/GRN No. 2 P0302 A29 BLU/RED No. 3 P0303 A28 WHT/BLU No. 4 P0304 A27 BRN Is there continuity? YES - Go to step 29. NO - Repair open in the wire between the ECM/PCM and the ignition coil.
Do an engine compression and a cylinder leakdown test. Did the engine pass both tests? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO UPDATE THE ECM/PCM»(ref-218783-S21903648732006021000000) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(ref-218785-S00586955502006021000000) ). NO - Repair the engine.
Disconnect ECM/PCM connector B (24P).
Turn the ignition switch ON (II).
Measure voltage between body ground and the appropriate ECM/PCM connector terminal (see table). ECM/PCM TERMINAL REFERENCE PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 B5 BRN No. 2 P0302 B4 RED No. 3 P0303 B3 BLU No. 4 P0304 B2 YEL Is there battery voltage? YES - Go to step 33. NO - Go to step 33 .
Turn the ignition switch OFF.
Disconnect the injector 2P connector from the problem cylinder.
Measure resistance between injector 2P connector terminals No. 1 and No. 2. Is there 10-13 ohms YES - Go to step 36. NO - Replace the injector (see «INJECTOR REPLACEMENT»(ref-218785-S20730632042006021000000) ).
Exchange the injector from the problem cylinder with one from another cylinder.
Reset the ECM/PCM.
Let the engine idle for 2 minutes.
Test-drive the vehicle several times in the range of the freeze data or under various conditions if there was no freeze data.
Check for a DTC or a Temporary DTC with a scan tool or the HDS. Is DTC or Temporary DTC P0301, P0302, P0303, or P0304 indicated? YES - Go to step 41. NO - Intermittent misfire due to injector malfunction.
Determine which cylinder(s) had the misfire. Does the misfire occur in the cylinder where the injector was exchanged? YES - Replace the faulty injector. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO UPDATE THE ECM/PCM»(ref-218783-S21903648732006021000000) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(ref-218785-S00586955502006021000000) ).
Turn the ignition switch OFF.
Disconnect the injector 2P connector from the problem cylinder.
Turn the ignition switch ON (II).
Measure voltage between injector 2P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 46. NO - Repair open in the wire between the injector and the PGM-FI main relay.
Turn the ignition switch OFF.
Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table). ECM/PCM TERMINAL REFERENCE PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 B5 BRN No. 2 P0302 B4 RED No. 3 P0303 B3 BLU No. 4 P0304 B2 YEL Is there continuity? YES - Repair short in the wire between the ECM/PCM and the injector. NO - Go to step 48.
Connect appropriate injector 2P connector terminal No. 2 to body ground with a jumper wire (see table). TERMINAL REFERENCE PROBLEM CYLINDER DTC WIRE COLOR No. 1 P0301 BRN No. 2 P0302 RED No. 3 P0303 BLU No. 4 P0304 YEL
Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table). ECM/PCM TERMINAL REFERENCE PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 B5 BRN No. 2 P0302 B4 RED No. 3 P0303 B3 BLU No. 4 P0304 B2 YEL Is there continuity? YES - Replace the injector (see «INJECTOR REPLACEMENT»(ref-218785-S20730632042006021000000) ), then recheck. NO - Repair open in the wire between the ECM/PCM and the injector.

Scheme 214

Scheme 214: DTC P0301, P0302, P0303, P0304: No. 1-4 Cylinder Misfire Detected (2002-2004 models)

Scheme 215

Scheme 216

Scheme 217

Scheme 218

Scheme 219

Scheme 220

Scheme 221

Scheme 222

Scheme 223

Scheme 224

Record all freeze data and on-board snapshots with the HDS.
Clear the DTC with the HDS.
Start the engine (in Park or neutral), then let it idle without load.
Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 9 . NO - If the screen indicates PASSED, go to step 5. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, wait for several minutes, and recheck.
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES - Go to step 9 . NO - Go to step 6.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Vehicle speed Throttle position CLV (calculated load value) Gear position
Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 9 . NO - If the screen indicates PASSED, go to step 8. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 6 and recheck.
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES - Go to step 9. NO - Intermittent failure, system is OK at this time.
Turn the ignition switch OFF.
Remove the intake manifold cover (see step 1 on «REMOVAL - K20A3 ENGINE»(ref-218780-S04931854062006021000000) ).
Start the engine, and listen for a clicking sound at the injector of the problem cylinder. Does the injector click? YES - Go to step 12. NO - Go to step 27 .
Turn the ignition switch OFF.
Exchange the ignition coil from the problem cylinder with one from another cylinder.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Vehicle speed Throttle position CLV (calculated load value) Gear position
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES - Go to step 16. NO - Intermittent misfire due to poor contact at the ignition coil connector (no misfire at this time). Make sure the coil connections are secure.
Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the ignition coil was moved? YES - Replace the faulty ignition coil (see «IGNITION COIL REMOVAL/INSTALLATION»(ref-218768-S10660455212006021000000) ), then go to step 63 . NO - Go to step 17.
Turn the ignition switch OFF.
Exchange the spark plug from the problem cylinder with one from another cylinder.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Vehicle speed Throttle position CLV (calculated load value) Gear position
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES - Go to step 21. NO - Intermittent misfire due to spark plug fouling (no misfire at this time).
Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the spark plug was moved? YES - Replace the faulty spark plug, then go to step 63 . NO - Go to step 22.
Turn the ignition switch OFF.
Exchange the injector from the problem cylinder with one from another cylinder.
Start the engine, and let it idle for 2 minutes.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Vehicle speed Throttle position CLV (calculated load value) Gear position
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES - Go to step 27. NO - Intermittent misfire due to bad contact in the injector connector (no misfire at this time). Check for poor connections or loose terminals at the injector.
Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the injector was moved? YES - Replace the faulty injector (see «INJECTOR REPLACEMENT»(ref-218785-S20730632042006021000000) ), then go to step 63 . NO - Go to step 28.
Turn the ignition switch OFF.
Disconnect the ignition coil 3P connector from the problem cylinder.
Turn the ignition switch ON (II).
Measure voltage between ignition coil 3P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 32. NO - Repair open in the wire between the ignition coil and the ignition coil relay, then go to step 63 .
Turn the ignition switch OFF.
Check for continuity between ignition coil 3P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 34. NO - Repair open in the wire between the ignition coil and G101, then go to step 63 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (31P).
Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table). ECM/PCM TERMINAL REFERENCE PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 A16 YEL/GRN No. 2 P0302 A15 BLU/RED No. 3 P0303 A14 WHT/BLU No. 4 P0304 A13 BRN Is there continuity? YES - Repair short in the wire between the ECM/PCM and the ignition coil, then go to step 63 . NO - Go to step 38.
Connect appropriate ignition coil 3P connector terminal No. 1 to body ground with a jumper wire (see table). TERMINAL REFERENCE PROBLEM CYLINDER DTC WIRE COLOR No. 1 P0301 YEL/GRN No. 2 P0302 BLU/RED No. 3 P0303 WHT/BLU No. 4 P0304 BRN
Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table). ECM/PCM TERMINAL REFERENCE PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 A16 YEL/GRN No. 2 P0302 A15 BLU/RED No. 3 P0303 A14 WHT/BLU No. 4 P0304 A13 BRN Is there continuity? YES - Go to step 40. NO - Repair open in the wire between the ECM/PCM and the ignition coil, then go to step 63 .
Reconnect the ignition coil 3P connector and ECM/PCM connector A (31P).
Do an engine compression and a cylinder leakdown test. Did the engine pass both tests? YES - Go to step 42. NO - Repair the engine, then go to step 63 .
Do the VTEC rocker arm test (see «VTEC ROCKER ARM TEST»(ref-218776-S33743682362006021000000) ). Did the VTEC rocker arm pass the test? YES - Go to step 72 . NO - Repair as necessary, then go to step 63 .
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (24P).
Turn the ignition switch ON (II).
Measure voltage between body ground and the appropriate ECM/PCM connector terminal (see table). ECM/PCM TERMINAL REFERENCE PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 B5 BRN No. 2 P0302 B4 RED No. 3 P0303 B3 BLU No. 4 P0304 B2 YEL Is there battery voltage? YES - Go to step 57 . NO - Go to step 48.
Turn the ignition switch OFF.
Remove the intake manifold cover (see step 1 on «REMOVAL - K20A3 ENGINE»(ref-218780-S04931854062006021000000) ).
Disconnect the injector 2P connector from the problem cylinder.
Turn the ignition switch ON (II).
Measure voltage between injector 2P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 53. NO - Repair open in the wire between the injector and the PGM-FI main relay, then go to step 63 .
Turn the ignition switch OFF.
Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table). ECM/PCM TERMINAL REFERENCE PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 B5 BRN No. 2 P0302 B4 RED No. 3 P0303 B3 BLU No. 4 P0304 B2 YEL Is there continuity? YES - Repair short in the wire between the ECM/PCM and the injector, then go to step 63 . NO - Go to step 55.
Connect appropriate injector 2P connector terminal No. 2 to body ground with a jumper wire (see table). TERMINAL REFERENCE PROBLEM CYLINDER DTC WIRE COLOR No. 1 P0301 BRN No. 2 P0302 RED No. 3 P0303 BLU No. 4 P0304 YEL
Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table). ECM/PCM TERMINAL REFERENCE PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 B5 BRN No. 2 P0302 B4 RED No. 3 P0303 B3 BLU No. 4 P0304 B2 YEL Is there continuity? YES - Go to step 57. NO - Repair open in the wire between the ECM/PCM and the injector, then go to step 63 .
Measure resistance between injector 2P connector terminals No. 1 and No. 2. Is there 10-13 ohms ? YES - Go to step 58. NO - Replace the injector (see «INJECTOR REPLACEMENT»(ref-218785-S20730632042006021000000) ), then go to step 63 .
Substitute a known-good injector from another cylinder to the problem cylinder.
Reconnect ECM/PCM connector B (24P).
Start the engine, and let it idle for 2 minutes.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Vehicle speed Throttle position CLV (calculated load value) Gear position
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES - Go to step 72 . NO - Replace the original injector (see «INJECTOR REPLACEMENT»(ref-218785-S20730632042006021000000) ), then go to step 63 .
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Clear the CKP pattern with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-218787-S18900728242006021000000) ).
Do the CKP pattern learn procedure (see «ECM/PCM RESET (2005-2006 MODELS)»(ref-218783-S41815111952006021000000) ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: Engine speed Vehicle speed Throttle position CLV (calculated load value) Gear position
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0301, P0302, P0303, or P0304 are indicated, check for poor connections or loose terminals at the ignition coil, the injector, and the ECM/PCM, then go to troubleshooting DTC P0300, P0301, P0302, P0303, or P0304 (see «DTC P0300: RANDOM MISFIRE DETECTED AND ANY COMBINATION OF THE FOLLOWING: (2005-2006 MODELS); DTC P0301: NO. 1 CYLINDER MISFIRE DETECTED (2005-2006 MODELS); DTC P0302: NO. 2 CYLINDER MISFIRE DETECTED (2005-2006 MODELS); DTC P0303: NO. 3 CYLINDER MISFIRE DETECTED (2005-2006 MODELS); DTC P0304: NO. 4 CYLINDER MISFIRE DETECTED (2005-2006 MODELS)»(ref-218785-S16745816892006021000000) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(ref-218785-S20313967292006021000000) . NO - Go to step 71.
Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. NO - If the screen indicates FAILED, go to step 1 and recheck. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 69 and recheck.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO UPDATE THE ECM/PCM»(ref-218783-S21903648732006021000000) «HOW TO UPDATE THE ECM/PCM»(ref-218783-S21903648732006021000000) ).
Test-drive the vehicle for several minutes in the range of the recorded freeze data.
Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0301, P0302, P0303, or P0304 are indicated, check for poor connections or loose terminals at the injector, the ignition coil, and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(ref-218785-S20313967292006021000000) . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(ref-218785-S00586955502006021000000) ).