Page 21 (Updated 23-Oct-2008)
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Self Diagnostics procedures for the Onboard Computers:
- General Overview, OBD
- ECU Engine Control Unit
- Reading Maxima 2002 OBD -codes
- TCU Transmission Control Unit for A/T
- ABS Anti-locking Brake System
Free Service Manual, Free Download.....see FAVORITE LINKS -page 26- FAVORITE LINKS
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General OBD-I & OBD-II On Board Diagnostics -info:
3gen Maxima 89-94 employs OBD-I on vehicle diagnostics system. It is very rare to see any error codes from it in any circumstances. The possible vehicle system error would be indicated in the dash red warning light "Malfunction Indicator Light" = MIL -code or via ECU leds. See these OBD-I MIL codes 0-to-55 on FSM EF&EC page 39.
Note that 4th gen Maxima 95-99 has OBD-II system, employing longer code system, past the 3gen last MIL code-55. The OBD-II codes are typically displayed in SAE-format, like P0101...
Here is an example from -95 FSM page EC-65 and forward:
MIL 11 = P0340 Campos sensor
MIL 12 = P0100 Air Flow Meter/Mass Air Flow Sensor.
MIL 101 = P0155 Front Heated Oxygen Sensor Heater Circuit right hand bank.
Code types used:
MIL: Nissan -code standard
0100: SAE -code standard
P0100: Nissan Consult (tester) -code display
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ECU Engine Control Unit
Self Diagnostics
(Location; see page 15 ) :
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Switch on the ignition, turn the ECU selector screw clockwise all the way, and watch the ECU LEDs. They'll flash once, then pause, twice then pause, and on up to five times to indicate the five diagnostic modes. When you see the number of the mode you want, turn the screw counter-clockwise.
Modes and codes
- Mode 1 is called the "Exhaust Gas Sensor Monitor" because it informs you about oxygen sensor activity. With the engine running and fully warmed up, the green LED should blink, going on when the sensor sends a lean signal and off when it sends a rich signal. You should see 5-10 flashes every 10 seconds. If the LED is on more than it's off, there's a lean condition, and vice versa. Sluggish blinking should make you suspect a fouled sensor.
- Mode 2 , the Mixture Ratio Feedback Control Monitor, lets you know whether or not the air/fuel mixture is being controlled within the proper range. If the red and green LEDs flash pretty much simultaneously with the engine running, mix control is okay. If the red LED is off more often than the green one, richness is indicated. If the red is on more than its mate, think lean.
- Mode 3 has the name "Self-Diagnostic," and it's more what you're used to on other vehicles because it yields fault codes, both hard and intermittent, which are communicated to you by means of the flashing of both LEDs. The red one gives the first digit, and the green one the second digit. For instance, if the red flashes twice, then the green flashes once, you've got a Code 21.
Get the engine up to normal temp, preferably by driving the car for 10 minutes, then pull the codes. In the case of a no-start, crank the engine for at least two seconds. If you see 55, all is well (in older models, 44 meant the same thing). Be sure to write down any other codes because they'll be erased when you go on to Mode 4, which means you will have lost any help on intermittents. Normally, codes are retained in memory for fifty starts.
- Mode 4 , called the "Switches On/Off Diagnostic Mode," checks the function of the switches that serve as inputs to the PCM, specifically those for ignition key start position, idle, and vehicle speed. For the first two, the red LED will go on or off when switch status is changed. In other words, with the ignition on, the red light should illuminate both when you step on the gas pedal and when you turn the key to start. If not, check the appropriate circuit. The vehicle speed sensor lights the green LED when you exceed 12 mph (get the drive wheels off the floor to do this in the shop, or have a helper drive while you keep your eyes on the PCM).
- Mode 5 ("Real-Time") gives instantaneous trouble codes to let you know what's going on right now in four monitored circuits. Codes are flashed out just once when a malfunction is detected, then they're immediately forgotten. And the way you read them is different -- you observe the flashing of one LED or the other, the red one reporting on the crank angle sensor and the fuel pump circuits, and the green on the air flow meter and ignition signal circuits.
If the red LED pulses out a series of long flashes separated by equally long pauses, a malfunction in the crank angle sensor or its circuit's indicated. Groups of three short flashes of the red LED point to the fuel pump or its circuit. With the green LED, two medium flashes followed by a pause, then two again, and so on, should cause you to suspect the air flow meter and its related wiring. Groups of four flashes mean there's a problem with the ignition signal.
This is an extremely sensitive and very useful mode. You can wiggle wires and connectors, rap on components, and have somebody else drive the car while you watch for those fleeting indications of trouble. You'll know everything's okay if you see no flashing in five minutes of revving and idling.
Code list:
11 Crank Angle Sensor/Camshaft Position Sensor.
12 Air Flow Meter/Mass Air Flow Sensor.
13 Engine Coolant Temperature Sensor.
14 Vehicle Speed Sensor.
21 Ignition Signal.
22 Fuel Pump.
23 Idle Switch.
24 Throttle Valve Switch.
25 Idle Speed Control Valve.
28 Cooling Fan Circuit.
31 ECM.
32 EGR Function.
33 Heated Oxygen Sensor.
34 Knock Sensor.
35 Exhaust Gas Temperature Sensor.
36 EGR Control-Back Pressure Transducer.
37 Knock Sensor.
38 Right hand bank Closed Loop (B2).
41 Intake Air Temperature Sensor.
42 Fuel Temperature Sensor.
43 Throttle Position Sensor.
45 Injector Leak.
47 Crankshaft Position Sensor.
51 Injector Circuit.
53 Oxygen Sensor.
54 A/T Control.
55 No Malfunction.
(VG30E OBD-I has only these 55 MIL -codes)
63 No. 6 Cylinder Misfire.
64 No. 5 Cylinder Misfire.
65 No. 4 Cylinder Misfire.
66 No. 3 Cylinder Misfire.
67 No. 2 Cylinder Misfire.
68 No. 1 Cylinder Misfire.
71 Random Misfire.
72 TWC Function right hand bank.
73 TWC Function right hand bank.
76 Fuel Injection System Function right hand bank.
77 Rear Heated Oxygen Sensor Circuit.
82 Crankshaft Position Sensor.
84 A/T Diagnosis Communication Line.
85 VTC Solenoid Valve Circuit.
86 Fuel Injection System Function right hand bank.
87 Canister Control Solenoid Valve Circuit.
91 Front Heated Oxygen Sensor Heater Circuit right hand bank.
94 TCC Solenoid Valve.
95 Crankshaft Position Sensor.
98 Engine Coolant Temperature Sensor.
101 Front Heated Oxygen Sensor Heater Circuit right hand bank.
103 Park/Neutral Position Switch Circuit.
105 EGR and EGR Canister Control Solenoid Valve Circuit.
108 Canister Purge Control Valve Circuit.
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0505 No self diagnostic codes present
0101 Camshaft position sensor
0102 Mass airflow sensor/circuit
0103 Coolant temperature sensor
0104 Vehicle speed sensor
0111
EVAP purge flow monitoring system
0114 Fuel system rich
0115 Fuel system lean
0201 Ignition signal
0203 Closed throttle switch
0205 IACV/AAC valve
0208 Overheating
0213 EVAP system
0214 Purge volume control valve
0301 ECM control unit
0302 EGR function
0303
Front heated oxygen sensor malfunction
0304 Knock sensor
0305 Exhaust gas temperature sensor
0306 EGRC BPT valve
0307 Closed loop operation
0309 Vent control valve
0311 Vacuum cut valve bypass valve
0312 EVAP system purge control valve
0401 Intake air temperature sensor
0402 Fuel temperature sensor or circuit
0403 Throttle position sensor
0409 Front oxygen sensor
0410 Front oxygen sensor
0411 Front oxygen sensor
0412 Front oxygen sensor
0503 Front oxygen sensor
0510 Rear oxygen sensor
0511 Rear oxygen sensor
0512 Rear oxygen sensor
0514 EGR system
0605 Cylinder 4 misfire
0606 Cylinder 3 misfire
0607 Cylinder 2 misfire
0608 Cylinder 1 misfire
0701 Multiple cylinder misfire
0702 Catalytic converter
0704 EVAP system
0705 EVAP system
0706 Fuel injection system malfunction
0707 Rear oxygen sensor
0801 Vacuum cut valve bypass valve or circuit
0802 Crankshaft sensor
0803 Absolute pressure sensor
0804 A/T diagnosis comm line
0807 EVAP canister purge control
0901 Front oxygen sensor heater
0902 Rear oxygen sensor heater
0903 Vent control valve
0905 Crankshaft position sensor
0908 Coolant temperature sensor
1003 Park/neutral switch
1005 EGR solenoid valve circuit
1008 EVAP system
1101 Inhibitor switch
1102 A/T vehicle speed sensor
1103 A/T first signal
1104 A/T second signal
1105 A/T third signal
1106 A/T fourth signal
1107 A/T torque converter clutch
1108 Shift solenoid A
1201 Shift solenoid B
1203 Overrun clutch solenoid
1204 TCC solenoid
1205 Line pressure solenoid
1206 TPS for A/T
1207 Speed signal A/T
1208 A/T fluid temperature sensor
1302 MAP/BAR switch solenoid valve or circuit
1305 Fuel pump control module or circuit
1308 Cooling fan
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"When battery terminal is disconnected, the diagnostic trouble code will be lost from the backup memory within 24 hours." FSM EF&EC -42.
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HOW TO SWITCH DIAGNOSTIC TEST MODE Maxima 2002 ; FSM page EC-94
Self-diagnostic results:
1. Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.
2. Repeat the following procedure quickly five times within 5 seconds.
1) Fully depress the accelerator pedal.
2) Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the MIL starts
blinking.
4. Fully release the accelerator pedal.
ECM has entered to Diagnostic Test Mode II (Self-diagnostic results). (...and will flash the 4 digit code until engine shut off.)
--- ECM Always returns to Diagnostic Test Mode I after ignition switch is turned “OFF”.
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TCU Transmission Control Unit for A/T
TCU SELF DIAGNOSTICS:
(see transmission electronics at page 15 , mechanics page 24 )
Overview:
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The Four Prerequisites to get the Self Diagnostics running :
1. Inhibitor Switch ok, (see how to test at page 15 )
2. TPS zero -position Switch ok (see how to test at page 6 ) and
3. Transmission Power/Comfort -Drive Mode Switch ok - or disconnected (see page 15 )
4. Brake pedal switch is ok (=brake lights ok)
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Drive Mode Switch: Selftest utilizes the transmission 3-drivemode switch and its mode-lights beside the gear selector in the cabin; see page 15 :
Every Time At Startup the Power Lamp comes on for 2 seconds: if Power Lamp blinks for 8 seconds, this indicates some problem has been already detected. (Power switch in A/T mode, Selector P, OD switch ON)
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Test ONLY after cleaning ALL connectors.
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Running the Test:
Following Procedure can also be found on Service Manual page AT-45 (Free Manual Download Links: see page 26 )
1. Start engine and warm it up to normal engine operating temperature, takes long, about 20min drive. However, when tranny is ok, 'cold test' will go through.
2. Turn ign switch to "OFF"
3. Set A/T mode switch to "AUTO"
4. Set O/D switch to "ON"
5. Move selector lever to "P" position
6. Turn ign switch "ON" (do not start engine)
---> Power indicator lamp should come on for about 2 seconds
7. Move selector lever to "D" while depressing brake pedal;
8. Turn ign switch "OFF";
9. Set O/D switch to "OFF";
10. Turn ign switch to "ON" (do not start engine);
11. Move selector lever to "2" position;
12. Set O/D switch to "ON";
13. Move selector lever to "1";
14. Set O/D switch to "OFF";
15. Depress accelerator pedal fully and release it
---> Check power indicator lamp: There should be one longer start signal followed by a series of TEN shorter signals. Note [if] which one of the TEN short signals is longest.
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Errorcodes:
1st flicker is ? longer than others: revolution sensor circuit;
2nd: vehicle speed sensor sensor circuit;
3rd: throttle position sensor circuit;
4th: shift solenoid valve A circuit;
5th: shift solenoid valve B circuit;
6th: timing solenoid valve circuit for; non limited slip tranny(89-94GXE); overrun clutch solenoid valve circuit for limited slip tranny (some, auto 92-94SE);
7th: torque converter clutch solenoid valve [=LOCKUP] circuit;
8th: fluid temperature sensor and A/T control unit power source circuit; 9th: engine speed signal circuit;
10th flicker is longer: line pressure solenoid valve circuit.
---> IF All TEN Signals Flicker lasts equal length: self-diag is OK.
Troubleshooting:
->The Power lamp does not come on at all; problem in inhibitor switch, overdrive switch, and/or throttle position switch circuit.
->Power Lamp comes on & goes off 4 times per second: Battery Power is low.
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Note: See page 6 TPS test procedures if TPS is suspect
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ABS Anti-locking Brake System:
ABS SELFTEST:
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Before test, open ABS computer main connector, clean & use contact grease. Also if suspect, open & service all sensor connectors. Refer to FSM BR-29. For ABS system parts refer to page 18 , general connector service page 14.
On 1993-94 models , drive the vehicle over 20 mph (32 km/h) for at least one minute. With the engine running, inspect the LED on the control unit in trunk roof. The codes will appear as flashes of the LED.
(On 1995-98 models , drive the vehicle over 20 mph (32 km/h) for at least one minute. Turn the ignition OFF. Ground the 4 terminal of the data link connector under the dashboard, then turn the ignition ON. The codes will appear as flashes of the ABS lamp on the dashboard.
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Do not press the brake pedal while reading codes.
Maxima 1993-94 model codes
1 Left Front actuator solenoid circuit
2 Right Front actuator solenoid circuit
3 Right rear actuator solenoid circuit
4 Left rear actuator solenoid circuit
5 Left Front wheel sensor circuit
6 Right Front wheel sensor circuit
7 Right rear wheel sensor circuit
8 Left rear wheel sensor circuit
9 Motor and motor relay
10 Solenoid valve relay
- 16 or continuous ...>Control unit
- Warning activates and led OFF: Power supply, Grounding problem
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"For what shall it profit a man, if he shall gain the whole world, and lose his own soul?" Creator of the Universum.
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