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88-94 & 95 Pathfinder, Quest, Truck & 300ZX diagnostic Modes & codes:
Prior to 1996 Nissan used it’s own OBD1 codes as did most manufactures. There are several ECM versions for these years, some ECM’s have a switch and some a turn screw, but the Modes and lights between these years mean the same thing as described below.
To Read codes on the ECM: Please Comment
Start the vehicle and let it run for 10 minutes. Turn the selector screw clockwise all the way, and watch the 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. If you miss the Mode you want it will repeat. After reading the codes turn the engine or key off, in the Mode you are in before changing codes or the stored codes in Mode 3 may be erased.

Mode 1: "Exhaust Gas Sensor Monitor". 5-10 flashes every 10 seconds. Green LED is ON more than it's OFF, there's a lean condition, and vice versa.

Mode 2: Air Fuel Mixture Ratio Feedback Control Monitor. If red and green LED's flash equally together/simultaneously mixture is correct. More Green = LEAN, and vice versa.

Mode 3: Stored FAULT codes.
After selecting Mode 3 in about five seconds it will start to output out the diagnostic codes. Take note of each code as it is displayed as such. The RED LED flashes for the 100’s & 10's position, and the Green LED flashes for the 1's position. Meaning: ie. Three red flash and three green flashes means code 33, Heated O2 Sensor circuit problem. There will be a pause between codes, and will repeat until the ignition switch is turned off or the Diagnostic switch is activated again.
IMPORTANT NOTE: On some Nissans if Mode 3 is selected followed by Mode 4 and then the key is turned off it will erase all stored codes in Mode 3. This can be helpful when trying to determine what faults have been corrected, provided the fault is not an intermittent fault. If the fault is intermittent they will appear after driving the vehicle when the ECM detects the fault again.

Mode 4: Switches On/Off Diagnostic Mode. Checks the function of the switches that serve as inputs to the ECU, specifically those for ignition key start position, idle, and vehicle speed. Refer to a factory service manual to perform these tests.

Mode 5: Real-Time. Gives instantaneous trouble codes to let you know what's going on right now in four monitored circuits. Refer to a factory service manual to perform these tests.

ECU CONSULT CODES DESCRIPTIONS:
88-95 96 Codes
11 P0340 Crank Angle Sensor/CMP Sensor
12 P0100 Air Flow Meter/MAF Sensor
13 P0115 ECT Sensor
14 P0500 VSS
21 P1320 Ignition Signal
22 P0505 Fuel Pump
23 P0605 Idle Switch (On/Off Diagnosis)
24 P0400 Throttle Valve Switch
25 P0150 ISC Valve
28 P1900 Cooling Fan Circuit (Overheat)
31 P0325 ECM
32 P1401 EGR Function
33 P0402 Heated O2 Sensor
34 & 37 P0130 Knock Sensor
35 P0150 Exhaust Gas Temperature Sensor
36 P0402 EGRC-BPT Valve
38 P0150 LH Bank Closed Loop (B2)
41 P0110 IAT Sensor
42 P0180 Fuel Temperature Sensor
43 P0120 TP Sensor
45 Injector Leak
47 P1335 CKP Sensor
51 Injector Circuit
53 P0130 O2S
54 P0600 A/T Control
55 P0000 No Malfunction
63 P0306 No. 6 Cylinder Misfire
64 P0305 No. 5 Cylinder Misfire
65 P0304 No. 4 Cylinder Misfire
66 P0303 No. 3 Cylinder Misfire
67 P0302 No. 2 Cylinder Misfire
68 P0301 No. 1 Cylinder Misfire
71 P0300 Random Misfire
72 P0420 TWC Function RH Bank
73 P0430 TWC Function LH Bank
76 P0170 Fuel Injection System Function RH Bank
77 P0136 Rear HO2S Circuit
82 P0335 CKP Sensor
84 P1605 A/T Diagnosis Communication Line
85 P1110 VTC Solenoid Valve Circuit
86 P0173 Fuel Injection System Function LH Bank
87 P0443 Canister Control Solenoid Valve Circuit
91 P0135 Front HO2S Heater Circuit RH Bank
94 P1550 TCC Solenoid Valve
95 P1336 CKP Sensor
98 P0125 ECT Sensor
101 P0155 Front HO2S Heater Circuit LH Bank
103 P0705 PNP Switch Circuit
105 P1400 EGR And EGR Canister Control Solenoid Valve Circuit
108 P0443 Canister Purge Control Valve Circuit
P0600 Continuous Improper A/T Control Unit Voltage To ECM

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