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Home >> Infiniti >> 1999 >> G20 Base, Automatic, RE4F03A >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Introduction >> Description & Operation >> Freeze-Frame Data
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Freeze-Frame Data

NOTE: 1st trip freeze-frame data values can only be displayed with Nissan's CONSULT, and are not displayed on GST scan tool.

Freeze-frame data is a "snapshot" of the operating conditions present when a fault is detected by PCM. When a fault is detected for the first time, PCM stores the first trip DTC, along with first trip freeze-frame data. Only one set of freeze-frame data can be stored in PCM (either first trip freeze-frame data or freeze-frame data). There is no priority for first trip freeze frame data. It is updated each time a different first trip DTC is stored. If a fault is detected for the second time, first trip freeze-frame data is replaced with freeze-frame data.

Freeze-frame data is updated in order of priority. See FREEZE FRAME PRIORITY IDENTIFICATION  table. If a priority 1 fault (misfire or fuel injection system malfunction) is detected in another trip when priority 2 freeze-frame data is already stored in PCM, priority 2 freeze-frame data will be replaced by priority 1 freeze-frame data.

NOTE: Only one 1st trip DTC and one freeze-frame data "snapshot" can be stored in PCM. If using GST, 1st trip DTC freeze-frame information may not be accessible. Use CONSULT to retrieve 1st trip DTC freeze-frame information.
FREEZE FRAME PRIORITY IDENTIFICATION

Priority Items
1 Freeze Frame Data For Misfire DTC P0300-P0308, Fuel Injection System DTC P0171, P0172
2 (1) 2nd Trip Freeze Frame Data
3 1st Trip Freeze Frame Data
(1) Not in priority 1.
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