I hope this help this shows how the ecm should look like and is a removel and instal of ecm with all locations
EDGE OF COMPUTERMODEL LOCATION
240SX ALL D
280ZX ALL A
300ZX TO '89 D
300ZX 90+ C
TRUCK & PATHFINDER
G20 ALL B
Q45 ALL ENG. = D TRANS =
SENTRA / 200SX 91+ B
MAXIMA 89+ B
MUST BE FLUSH WITH
EDGE OF COMPUTER
LOCATE THE ECU ON THE CHART BELOW.
DISCONNECT THE BATTERY.
UNBOLT THE ECU FROM THE VEHICLE AND USING A 10 M.M. SOCKET (SINGLE
CONNECTOR TYPE ONLY), DISCONNECT THE ELECTRICAL CONNECTOR.
INSTALL NEW ECU IN REVERSE ORDER MAKING SURE THAT THE ELECTRICAL
CONNECTOR IS FULLY SEATED AS SHOWN BELOW . FAILURE TO DO THIS WILL
RESULT IN ABNORMAL PERFORMANCE OF THE VEHICLE.
INSTALLING A NISSAN ECU
NOTE: FOR SINGLE CONNECTOR TYPE ECU'S
The self-diagnostic system is useful to diagnose malfunctions in major sensors and actuators of the ECCS system. The ECU constantly monitors the function of these sensor and actuator circuits, regardless of ignition key position. If a malfunction occurs, information is stored in the ECU and can be retrieved from the memory by turning on the diagnostic mode selector, located on the side of the ECU. When activated the malfunction is indicated by flashing a red and green LED light emitting diode, also located on the ECU. Since all the self-diagnostic results are stored in the ECU memory, even intermittent malfunctions can be diagnosed.
A malfunctioning parts group is indicated by the number of both the red and green LEDs flashing. First, the red flashes, then the green flashes follow. The red LED refers to the number of the tens digit while the green one refers to the number of the units digit. For example, when the red LED flashes three times and then the green on flashes twice, this means the number 32. In this way, all problems are classified by the code numbers.
Perform self-diagnosis with engine sufficiently warmed up. After a malfunctioning component has been corrected, be sure to erase memory. To erase code memory:
Turn ignition switch ON.
Turn diagnosis mode selector ON.
Wait for 2 seconds.
Turn diagnosis mode selector OFF.
Wait 2 seconds. Memory erasure has been completed.
The stored memory would be lost if battery terminal is disconnected
See Figures 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11
Fig. 1: ECU code table-Z24i engine through 1986
Fig. 2: Diagnostic procedures-Z24i engine through 1986
Fig. 3: Diagnostic procedures-Z24i engine through 1986
Fig. 4: Diagnostic procedures-Z24i engine through 1986
Fig. 5: Diagnostic procedures-Z24i engine through 1986
Fig. 6: ECU code table-VG30i engine through 1986
Fig. 7: Diagnostic procedures-VG30i engine through 1986
Fig. 8: Diagnostic procedures-VG30i engine through 1986
Fig. 9: Diagnostic procedures-VG30i engine through 1986
Fig. 10: Diagnostic procedures-VG30i engine through 1986
Fig. 11: ECU code table-1987-88 Z24i and VG30i engines
Sunday, December 7th, 2008 AT 3:28 PM